[3] | 1 | """A collection of string operations (most are no longer used). |
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| 2 | |
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| 3 | Warning: most of the code you see here isn't normally used nowadays. |
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| 4 | Beginning with Python 1.6, many of these functions are implemented as |
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| 5 | methods on the standard string object. They used to be implemented by |
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| 6 | a built-in module called strop, but strop is now obsolete itself. |
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| 7 | |
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| 8 | Public module variables: |
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| 9 | |
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| 10 | whitespace -- a string containing all characters considered whitespace |
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| 11 | lowercase -- a string containing all characters considered lowercase letters |
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| 12 | uppercase -- a string containing all characters considered uppercase letters |
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| 13 | letters -- a string containing all characters considered letters |
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| 14 | digits -- a string containing all characters considered decimal digits |
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| 15 | hexdigits -- a string containing all characters considered hexadecimal digits |
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| 16 | octdigits -- a string containing all characters considered octal digits |
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| 17 | punctuation -- a string containing all characters considered punctuation |
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| 18 | printable -- a string containing all characters considered printable |
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| 19 | |
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| 20 | """ |
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| 21 | |
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| 22 | # Some strings for ctype-style character classification |
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| 23 | whitespace = ' \t\n\r\v\f' |
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| 24 | lowercase = 'abcdefghijklmnopqrstuvwxyz' |
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| 25 | uppercase = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' |
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| 26 | letters = lowercase + uppercase |
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| 27 | ascii_lowercase = lowercase |
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| 28 | ascii_uppercase = uppercase |
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| 29 | ascii_letters = ascii_lowercase + ascii_uppercase |
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| 30 | digits = '0123456789' |
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| 31 | hexdigits = digits + 'abcdef' + 'ABCDEF' |
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| 32 | octdigits = '01234567' |
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| 33 | punctuation = """!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~""" |
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| 34 | printable = digits + letters + punctuation + whitespace |
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| 35 | |
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| 36 | # Case conversion helpers |
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| 37 | # Use str to convert Unicode literal in case of -U |
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| 38 | # Note that Cookie.py bogusly uses _idmap :( |
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| 39 | l = map(chr, xrange(256)) |
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| 40 | _idmap = str('').join(l) |
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| 41 | del l |
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| 42 | |
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| 43 | # Functions which aren't available as string methods. |
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| 44 | |
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| 45 | # Capitalize the words in a string, e.g. " aBc dEf " -> "Abc Def". |
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| 46 | # See also regsub.capwords(). |
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| 47 | def capwords(s, sep=None): |
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| 48 | """capwords(s, [sep]) -> string |
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| 49 | |
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| 50 | Split the argument into words using split, capitalize each |
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| 51 | word using capitalize, and join the capitalized words using |
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| 52 | join. Note that this replaces runs of whitespace characters by |
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| 53 | a single space. |
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| 54 | |
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| 55 | """ |
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| 56 | return (sep or ' ').join([x.capitalize() for x in s.split(sep)]) |
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| 57 | |
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| 58 | |
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| 59 | # Construct a translation string |
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| 60 | _idmapL = None |
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| 61 | def maketrans(fromstr, tostr): |
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| 62 | """maketrans(frm, to) -> string |
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| 63 | |
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| 64 | Return a translation table (a string of 256 bytes long) |
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| 65 | suitable for use in string.translate. The strings frm and to |
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| 66 | must be of the same length. |
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| 67 | |
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| 68 | """ |
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| 69 | if len(fromstr) != len(tostr): |
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| 70 | raise ValueError, "maketrans arguments must have same length" |
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| 71 | global _idmapL |
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| 72 | if not _idmapL: |
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| 73 | _idmapL = map(None, _idmap) |
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| 74 | L = _idmapL[:] |
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| 75 | fromstr = map(ord, fromstr) |
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| 76 | for i in range(len(fromstr)): |
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| 77 | L[fromstr[i]] = tostr[i] |
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| 78 | return ''.join(L) |
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| 79 | |
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| 80 | |
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| 81 | |
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| 82 | #################################################################### |
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| 83 | import re as _re |
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| 84 | |
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| 85 | class _multimap: |
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| 86 | """Helper class for combining multiple mappings. |
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| 87 | |
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| 88 | Used by .{safe_,}substitute() to combine the mapping and keyword |
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| 89 | arguments. |
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| 90 | """ |
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| 91 | def __init__(self, primary, secondary): |
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| 92 | self._primary = primary |
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| 93 | self._secondary = secondary |
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| 94 | |
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| 95 | def __getitem__(self, key): |
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| 96 | try: |
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| 97 | return self._primary[key] |
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| 98 | except KeyError: |
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| 99 | return self._secondary[key] |
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| 100 | |
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| 101 | |
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| 102 | class _TemplateMetaclass(type): |
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| 103 | pattern = r""" |
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| 104 | %(delim)s(?: |
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| 105 | (?P<escaped>%(delim)s) | # Escape sequence of two delimiters |
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| 106 | (?P<named>%(id)s) | # delimiter and a Python identifier |
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| 107 | {(?P<braced>%(id)s)} | # delimiter and a braced identifier |
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| 108 | (?P<invalid>) # Other ill-formed delimiter exprs |
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| 109 | ) |
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| 110 | """ |
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| 111 | |
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| 112 | def __init__(cls, name, bases, dct): |
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| 113 | super(_TemplateMetaclass, cls).__init__(name, bases, dct) |
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| 114 | if 'pattern' in dct: |
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| 115 | pattern = cls.pattern |
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| 116 | else: |
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| 117 | pattern = _TemplateMetaclass.pattern % { |
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| 118 | 'delim' : _re.escape(cls.delimiter), |
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| 119 | 'id' : cls.idpattern, |
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| 120 | } |
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| 121 | cls.pattern = _re.compile(pattern, _re.IGNORECASE | _re.VERBOSE) |
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| 122 | |
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| 123 | |
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| 124 | class Template: |
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| 125 | """A string class for supporting $-substitutions.""" |
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| 126 | __metaclass__ = _TemplateMetaclass |
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| 127 | |
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| 128 | delimiter = '$' |
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| 129 | idpattern = r'[_a-z][_a-z0-9]*' |
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| 130 | |
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| 131 | def __init__(self, template): |
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| 132 | self.template = template |
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| 133 | |
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| 134 | # Search for $$, $identifier, ${identifier}, and any bare $'s |
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| 135 | |
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| 136 | def _invalid(self, mo): |
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| 137 | i = mo.start('invalid') |
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| 138 | lines = self.template[:i].splitlines(True) |
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| 139 | if not lines: |
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| 140 | colno = 1 |
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| 141 | lineno = 1 |
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| 142 | else: |
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| 143 | colno = i - len(''.join(lines[:-1])) |
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| 144 | lineno = len(lines) |
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| 145 | raise ValueError('Invalid placeholder in string: line %d, col %d' % |
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| 146 | (lineno, colno)) |
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| 147 | |
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| 148 | def substitute(self, *args, **kws): |
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| 149 | if len(args) > 1: |
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| 150 | raise TypeError('Too many positional arguments') |
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| 151 | if not args: |
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| 152 | mapping = kws |
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| 153 | elif kws: |
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| 154 | mapping = _multimap(kws, args[0]) |
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| 155 | else: |
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| 156 | mapping = args[0] |
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| 157 | # Helper function for .sub() |
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| 158 | def convert(mo): |
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| 159 | # Check the most common path first. |
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| 160 | named = mo.group('named') or mo.group('braced') |
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| 161 | if named is not None: |
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| 162 | val = mapping[named] |
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| 163 | # We use this idiom instead of str() because the latter will |
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| 164 | # fail if val is a Unicode containing non-ASCII characters. |
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| 165 | return '%s' % val |
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| 166 | if mo.group('escaped') is not None: |
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| 167 | return self.delimiter |
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| 168 | if mo.group('invalid') is not None: |
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| 169 | self._invalid(mo) |
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| 170 | raise ValueError('Unrecognized named group in pattern', |
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| 171 | self.pattern) |
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| 172 | return self.pattern.sub(convert, self.template) |
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| 173 | |
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| 174 | def safe_substitute(self, *args, **kws): |
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| 175 | if len(args) > 1: |
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| 176 | raise TypeError('Too many positional arguments') |
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| 177 | if not args: |
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| 178 | mapping = kws |
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| 179 | elif kws: |
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| 180 | mapping = _multimap(kws, args[0]) |
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| 181 | else: |
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| 182 | mapping = args[0] |
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| 183 | # Helper function for .sub() |
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| 184 | def convert(mo): |
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| 185 | named = mo.group('named') |
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| 186 | if named is not None: |
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| 187 | try: |
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| 188 | # We use this idiom instead of str() because the latter |
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| 189 | # will fail if val is a Unicode containing non-ASCII |
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| 190 | return '%s' % mapping[named] |
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| 191 | except KeyError: |
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| 192 | return self.delimiter + named |
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| 193 | braced = mo.group('braced') |
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| 194 | if braced is not None: |
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| 195 | try: |
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| 196 | return '%s' % mapping[braced] |
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| 197 | except KeyError: |
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| 198 | return self.delimiter + '{' + braced + '}' |
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| 199 | if mo.group('escaped') is not None: |
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| 200 | return self.delimiter |
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| 201 | if mo.group('invalid') is not None: |
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| 202 | return self.delimiter |
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| 203 | raise ValueError('Unrecognized named group in pattern', |
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| 204 | self.pattern) |
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| 205 | return self.pattern.sub(convert, self.template) |
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| 206 | |
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| 207 | |
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| 208 | |
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| 209 | #################################################################### |
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| 210 | # NOTE: Everything below here is deprecated. Use string methods instead. |
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| 211 | # This stuff will go away in Python 3.0. |
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| 212 | |
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| 213 | # Backward compatible names for exceptions |
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| 214 | index_error = ValueError |
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| 215 | atoi_error = ValueError |
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| 216 | atof_error = ValueError |
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| 217 | atol_error = ValueError |
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| 218 | |
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| 219 | # convert UPPER CASE letters to lower case |
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| 220 | def lower(s): |
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| 221 | """lower(s) -> string |
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| 222 | |
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| 223 | Return a copy of the string s converted to lowercase. |
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| 224 | |
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| 225 | """ |
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| 226 | return s.lower() |
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| 227 | |
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| 228 | # Convert lower case letters to UPPER CASE |
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| 229 | def upper(s): |
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| 230 | """upper(s) -> string |
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| 231 | |
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| 232 | Return a copy of the string s converted to uppercase. |
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| 233 | |
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| 234 | """ |
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| 235 | return s.upper() |
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| 236 | |
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| 237 | # Swap lower case letters and UPPER CASE |
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| 238 | def swapcase(s): |
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| 239 | """swapcase(s) -> string |
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| 240 | |
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| 241 | Return a copy of the string s with upper case characters |
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| 242 | converted to lowercase and vice versa. |
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| 243 | |
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| 244 | """ |
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| 245 | return s.swapcase() |
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| 246 | |
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| 247 | # Strip leading and trailing tabs and spaces |
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| 248 | def strip(s, chars=None): |
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| 249 | """strip(s [,chars]) -> string |
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| 250 | |
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| 251 | Return a copy of the string s with leading and trailing |
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| 252 | whitespace removed. |
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| 253 | If chars is given and not None, remove characters in chars instead. |
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| 254 | If chars is unicode, S will be converted to unicode before stripping. |
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| 255 | |
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| 256 | """ |
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| 257 | return s.strip(chars) |
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| 258 | |
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| 259 | # Strip leading tabs and spaces |
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| 260 | def lstrip(s, chars=None): |
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| 261 | """lstrip(s [,chars]) -> string |
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| 262 | |
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| 263 | Return a copy of the string s with leading whitespace removed. |
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| 264 | If chars is given and not None, remove characters in chars instead. |
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| 265 | |
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| 266 | """ |
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| 267 | return s.lstrip(chars) |
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| 268 | |
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| 269 | # Strip trailing tabs and spaces |
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| 270 | def rstrip(s, chars=None): |
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| 271 | """rstrip(s [,chars]) -> string |
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| 272 | |
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| 273 | Return a copy of the string s with trailing whitespace removed. |
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| 274 | If chars is given and not None, remove characters in chars instead. |
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| 275 | |
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| 276 | """ |
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| 277 | return s.rstrip(chars) |
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| 278 | |
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| 279 | |
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| 280 | # Split a string into a list of space/tab-separated words |
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| 281 | def split(s, sep=None, maxsplit=-1): |
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| 282 | """split(s [,sep [,maxsplit]]) -> list of strings |
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| 283 | |
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| 284 | Return a list of the words in the string s, using sep as the |
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| 285 | delimiter string. If maxsplit is given, splits at no more than |
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| 286 | maxsplit places (resulting in at most maxsplit+1 words). If sep |
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| 287 | is not specified or is None, any whitespace string is a separator. |
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| 288 | |
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| 289 | (split and splitfields are synonymous) |
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| 290 | |
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| 291 | """ |
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| 292 | return s.split(sep, maxsplit) |
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| 293 | splitfields = split |
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| 294 | |
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| 295 | # Split a string into a list of space/tab-separated words |
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| 296 | def rsplit(s, sep=None, maxsplit=-1): |
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| 297 | """rsplit(s [,sep [,maxsplit]]) -> list of strings |
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| 298 | |
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| 299 | Return a list of the words in the string s, using sep as the |
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| 300 | delimiter string, starting at the end of the string and working |
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| 301 | to the front. If maxsplit is given, at most maxsplit splits are |
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| 302 | done. If sep is not specified or is None, any whitespace string |
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| 303 | is a separator. |
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| 304 | """ |
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| 305 | return s.rsplit(sep, maxsplit) |
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| 306 | |
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| 307 | # Join fields with optional separator |
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| 308 | def join(words, sep = ' '): |
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| 309 | """join(list [,sep]) -> string |
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| 310 | |
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| 311 | Return a string composed of the words in list, with |
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| 312 | intervening occurrences of sep. The default separator is a |
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| 313 | single space. |
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| 314 | |
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| 315 | (joinfields and join are synonymous) |
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| 316 | |
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| 317 | """ |
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| 318 | return sep.join(words) |
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| 319 | joinfields = join |
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| 320 | |
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| 321 | # Find substring, raise exception if not found |
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| 322 | def index(s, *args): |
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| 323 | """index(s, sub [,start [,end]]) -> int |
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| 324 | |
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| 325 | Like find but raises ValueError when the substring is not found. |
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| 326 | |
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| 327 | """ |
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| 328 | return s.index(*args) |
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| 329 | |
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| 330 | # Find last substring, raise exception if not found |
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| 331 | def rindex(s, *args): |
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| 332 | """rindex(s, sub [,start [,end]]) -> int |
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| 333 | |
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| 334 | Like rfind but raises ValueError when the substring is not found. |
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| 335 | |
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| 336 | """ |
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| 337 | return s.rindex(*args) |
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| 338 | |
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| 339 | # Count non-overlapping occurrences of substring |
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| 340 | def count(s, *args): |
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| 341 | """count(s, sub[, start[,end]]) -> int |
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| 342 | |
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| 343 | Return the number of occurrences of substring sub in string |
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| 344 | s[start:end]. Optional arguments start and end are |
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| 345 | interpreted as in slice notation. |
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| 346 | |
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| 347 | """ |
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| 348 | return s.count(*args) |
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| 349 | |
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| 350 | # Find substring, return -1 if not found |
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| 351 | def find(s, *args): |
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| 352 | """find(s, sub [,start [,end]]) -> in |
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| 353 | |
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| 354 | Return the lowest index in s where substring sub is found, |
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| 355 | such that sub is contained within s[start,end]. Optional |
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| 356 | arguments start and end are interpreted as in slice notation. |
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| 357 | |
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| 358 | Return -1 on failure. |
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| 359 | |
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| 360 | """ |
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| 361 | return s.find(*args) |
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| 362 | |
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| 363 | # Find last substring, return -1 if not found |
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| 364 | def rfind(s, *args): |
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| 365 | """rfind(s, sub [,start [,end]]) -> int |
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| 366 | |
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| 367 | Return the highest index in s where substring sub is found, |
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| 368 | such that sub is contained within s[start,end]. Optional |
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| 369 | arguments start and end are interpreted as in slice notation. |
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| 370 | |
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| 371 | Return -1 on failure. |
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| 372 | |
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| 373 | """ |
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| 374 | return s.rfind(*args) |
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| 375 | |
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| 376 | # for a bit of speed |
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| 377 | _float = float |
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| 378 | _int = int |
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| 379 | _long = long |
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| 380 | |
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| 381 | # Convert string to float |
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| 382 | def atof(s): |
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| 383 | """atof(s) -> float |
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| 384 | |
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| 385 | Return the floating point number represented by the string s. |
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| 386 | |
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| 387 | """ |
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| 388 | return _float(s) |
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| 389 | |
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| 390 | |
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| 391 | # Convert string to integer |
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| 392 | def atoi(s , base=10): |
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| 393 | """atoi(s [,base]) -> int |
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| 394 | |
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| 395 | Return the integer represented by the string s in the given |
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| 396 | base, which defaults to 10. The string s must consist of one |
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| 397 | or more digits, possibly preceded by a sign. If base is 0, it |
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| 398 | is chosen from the leading characters of s, 0 for octal, 0x or |
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| 399 | 0X for hexadecimal. If base is 16, a preceding 0x or 0X is |
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| 400 | accepted. |
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| 401 | |
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| 402 | """ |
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| 403 | return _int(s, base) |
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| 404 | |
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| 405 | |
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| 406 | # Convert string to long integer |
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| 407 | def atol(s, base=10): |
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| 408 | """atol(s [,base]) -> long |
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| 409 | |
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| 410 | Return the long integer represented by the string s in the |
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| 411 | given base, which defaults to 10. The string s must consist |
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| 412 | of one or more digits, possibly preceded by a sign. If base |
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| 413 | is 0, it is chosen from the leading characters of s, 0 for |
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| 414 | octal, 0x or 0X for hexadecimal. If base is 16, a preceding |
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| 415 | 0x or 0X is accepted. A trailing L or l is not accepted, |
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| 416 | unless base is 0. |
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| 417 | |
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| 418 | """ |
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| 419 | return _long(s, base) |
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| 420 | |
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| 421 | |
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| 422 | # Left-justify a string |
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| 423 | def ljust(s, width, *args): |
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| 424 | """ljust(s, width[, fillchar]) -> string |
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| 425 | |
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| 426 | Return a left-justified version of s, in a field of the |
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| 427 | specified width, padded with spaces as needed. The string is |
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| 428 | never truncated. If specified the fillchar is used instead of spaces. |
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| 429 | |
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| 430 | """ |
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| 431 | return s.ljust(width, *args) |
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| 432 | |
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| 433 | # Right-justify a string |
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| 434 | def rjust(s, width, *args): |
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| 435 | """rjust(s, width[, fillchar]) -> string |
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| 436 | |
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| 437 | Return a right-justified version of s, in a field of the |
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| 438 | specified width, padded with spaces as needed. The string is |
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| 439 | never truncated. If specified the fillchar is used instead of spaces. |
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| 440 | |
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| 441 | """ |
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| 442 | return s.rjust(width, *args) |
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| 443 | |
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| 444 | # Center a string |
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| 445 | def center(s, width, *args): |
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| 446 | """center(s, width[, fillchar]) -> string |
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| 447 | |
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| 448 | Return a center version of s, in a field of the specified |
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| 449 | width. padded with spaces as needed. The string is never |
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| 450 | truncated. If specified the fillchar is used instead of spaces. |
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| 451 | |
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| 452 | """ |
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| 453 | return s.center(width, *args) |
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| 454 | |
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| 455 | # Zero-fill a number, e.g., (12, 3) --> '012' and (-3, 3) --> '-03' |
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| 456 | # Decadent feature: the argument may be a string or a number |
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| 457 | # (Use of this is deprecated; it should be a string as with ljust c.s.) |
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| 458 | def zfill(x, width): |
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| 459 | """zfill(x, width) -> string |
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| 460 | |
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| 461 | Pad a numeric string x with zeros on the left, to fill a field |
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| 462 | of the specified width. The string x is never truncated. |
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| 463 | |
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| 464 | """ |
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| 465 | if not isinstance(x, basestring): |
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| 466 | x = repr(x) |
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| 467 | return x.zfill(width) |
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| 468 | |
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| 469 | # Expand tabs in a string. |
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| 470 | # Doesn't take non-printing chars into account, but does understand \n. |
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| 471 | def expandtabs(s, tabsize=8): |
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| 472 | """expandtabs(s [,tabsize]) -> string |
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| 473 | |
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| 474 | Return a copy of the string s with all tab characters replaced |
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| 475 | by the appropriate number of spaces, depending on the current |
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| 476 | column, and the tabsize (default 8). |
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| 477 | |
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| 478 | """ |
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| 479 | return s.expandtabs(tabsize) |
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| 480 | |
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| 481 | # Character translation through look-up table. |
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| 482 | def translate(s, table, deletions=""): |
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| 483 | """translate(s,table [,deletions]) -> string |
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| 484 | |
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| 485 | Return a copy of the string s, where all characters occurring |
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| 486 | in the optional argument deletions are removed, and the |
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| 487 | remaining characters have been mapped through the given |
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| 488 | translation table, which must be a string of length 256. The |
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| 489 | deletions argument is not allowed for Unicode strings. |
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| 490 | |
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| 491 | """ |
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| 492 | if deletions: |
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| 493 | return s.translate(table, deletions) |
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| 494 | else: |
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| 495 | # Add s[:0] so that if s is Unicode and table is an 8-bit string, |
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| 496 | # table is converted to Unicode. This means that table *cannot* |
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| 497 | # be a dictionary -- for that feature, use u.translate() directly. |
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| 498 | return s.translate(table + s[:0]) |
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| 499 | |
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| 500 | # Capitalize a string, e.g. "aBc dEf" -> "Abc def". |
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| 501 | def capitalize(s): |
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| 502 | """capitalize(s) -> string |
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| 503 | |
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| 504 | Return a copy of the string s with only its first character |
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| 505 | capitalized. |
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| 506 | |
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| 507 | """ |
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| 508 | return s.capitalize() |
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| 509 | |
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| 510 | # Substring replacement (global) |
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| 511 | def replace(s, old, new, maxsplit=-1): |
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| 512 | """replace (str, old, new[, maxsplit]) -> string |
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| 513 | |
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| 514 | Return a copy of string str with all occurrences of substring |
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| 515 | old replaced by new. If the optional argument maxsplit is |
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| 516 | given, only the first maxsplit occurrences are replaced. |
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| 517 | |
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| 518 | """ |
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| 519 | return s.replace(old, new, maxsplit) |
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| 520 | |
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| 521 | |
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| 522 | # Try importing optional built-in module "strop" -- if it exists, |
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| 523 | # it redefines some string operations that are 100-1000 times faster. |
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| 524 | # It also defines values for whitespace, lowercase and uppercase |
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| 525 | # that match <ctype.h>'s definitions. |
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| 526 | |
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| 527 | try: |
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| 528 | from strop import maketrans, lowercase, uppercase, whitespace |
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| 529 | letters = lowercase + uppercase |
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| 530 | except ImportError: |
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| 531 | pass # Use the original versions |
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