Mercurial > cpython-lru_cache-weakref

annotate Lib/UserString.py @ 44685:e511ccf2ffbe legacy-trunk

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Tighten the definition of a named tuple.
author Raymond Hettinger <python@rcn.com>
date Tue, 15 Jan 2008 03:07:42 +0000
parents 9620134010a5
children feb6dd36d53f
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a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
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1 #!/usr/bin/env python
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2 ## vim:ts=4:et:nowrap
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3 """A user-defined wrapper around string objects
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4
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5 Note: string objects have grown methods in Python 1.6
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6 This module requires Python 1.6 or later.
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7 """
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8 import sys
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9
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10 __all__ = ["UserString","MutableString"]
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11
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12 class UserString:
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13 def __init__(self, seq):
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14 if isinstance(seq, basestring):
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15 self.data = seq
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16 elif isinstance(seq, UserString):
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17 self.data = seq.data[:]
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18 else:
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19 self.data = str(seq)
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20 def __str__(self): return str(self.data)
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21 def __repr__(self): return repr(self.data)
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22 def __int__(self): return int(self.data)
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23 def __long__(self): return long(self.data)
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24 def __float__(self): return float(self.data)
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25 def __complex__(self): return complex(self.data)
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26 def __hash__(self): return hash(self.data)
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27
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28 def __cmp__(self, string):
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29 if isinstance(string, UserString):
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30 return cmp(self.data, string.data)
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31 else:
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32 return cmp(self.data, string)
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33 def __contains__(self, char):
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34 return char in self.data
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35
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36 def __len__(self): return len(self.data)
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37 def __getitem__(self, index): return self.__class__(self.data[index])
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38 def __getslice__(self, start, end):
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39 start = max(start, 0); end = max(end, 0)
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40 return self.__class__(self.data[start:end])
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41
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42 def __add__(self, other):
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43 if isinstance(other, UserString):
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44 return self.__class__(self.data + other.data)
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45 elif isinstance(other, basestring):
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46 return self.__class__(self.data + other)
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47 else:
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48 return self.__class__(self.data + str(other))
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49 def __radd__(self, other):
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50 if isinstance(other, basestring):
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51 return self.__class__(other + self.data)
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52 else:
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53 return self.__class__(str(other) + self.data)
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54 def __mul__(self, n):
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55 return self.__class__(self.data*n)
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56 __rmul__ = __mul__
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57 def __mod__(self, args):
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58 return self.__class__(self.data % args)
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59
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60 # the following methods are defined in alphabetical order:
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61 def capitalize(self): return self.__class__(self.data.capitalize())
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62 def center(self, width, *args):
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63 return self.__class__(self.data.center(width, *args))
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64 def count(self, sub, start=0, end=sys.maxint):
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65 return self.data.count(sub, start, end)
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66 def decode(self, encoding=None, errors=None): # XXX improve this?
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67 if encoding:
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68 if errors:
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69 return self.__class__(self.data.decode(encoding, errors))
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70 else:
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71 return self.__class__(self.data.decode(encoding))
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72 else:
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73 return self.__class__(self.data.decode())
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74 def encode(self, encoding=None, errors=None): # XXX improve this?
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75 if encoding:
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76 if errors:
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77 return self.__class__(self.data.encode(encoding, errors))
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78 else:
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79 return self.__class__(self.data.encode(encoding))
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80 else:
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81 return self.__class__(self.data.encode())
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82 def endswith(self, suffix, start=0, end=sys.maxint):
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83 return self.data.endswith(suffix, start, end)
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84 def expandtabs(self, tabsize=8):
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85 return self.__class__(self.data.expandtabs(tabsize))
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86 def find(self, sub, start=0, end=sys.maxint):
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87 return self.data.find(sub, start, end)
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88 def index(self, sub, start=0, end=sys.maxint):
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89 return self.data.index(sub, start, end)
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90 def isalpha(self): return self.data.isalpha()
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91 def isalnum(self): return self.data.isalnum()
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92 def isdecimal(self): return self.data.isdecimal()
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93 def isdigit(self): return self.data.isdigit()
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94 def islower(self): return self.data.islower()
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95 def isnumeric(self): return self.data.isnumeric()
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96 def isspace(self): return self.data.isspace()
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97 def istitle(self): return self.data.istitle()
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98 def isupper(self): return self.data.isupper()
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99 def join(self, seq): return self.data.join(seq)
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100 def ljust(self, width, *args):
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101 return self.__class__(self.data.ljust(width, *args))
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102 def lower(self): return self.__class__(self.data.lower())
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103 def lstrip(self, chars=None): return self.__class__(self.data.lstrip(chars))
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104 def partition(self, sep):
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105 return self.data.partition(sep)
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106 def replace(self, old, new, maxsplit=-1):
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107 return self.__class__(self.data.replace(old, new, maxsplit))
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108 def rfind(self, sub, start=0, end=sys.maxint):
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109 return self.data.rfind(sub, start, end)
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110 def rindex(self, sub, start=0, end=sys.maxint):
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111 return self.data.rindex(sub, start, end)
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112 def rjust(self, width, *args):
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113 return self.__class__(self.data.rjust(width, *args))
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114 def rpartition(self, sep):
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115 return self.data.rpartition(sep)
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116 def rstrip(self, chars=None): return self.__class__(self.data.rstrip(chars))
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117 def split(self, sep=None, maxsplit=-1):
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118 return self.data.split(sep, maxsplit)
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119 def rsplit(self, sep=None, maxsplit=-1):
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120 return self.data.rsplit(sep, maxsplit)
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121 def splitlines(self, keepends=0): return self.data.splitlines(keepends)
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122 def startswith(self, prefix, start=0, end=sys.maxint):
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123 return self.data.startswith(prefix, start, end)
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parents: 26277
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124 def strip(self, chars=None): return self.__class__(self.data.strip(chars))
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125 def swapcase(self): return self.__class__(self.data.swapcase())
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parents:
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126 def title(self): return self.__class__(self.data.title())
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Tim Peters <tim.peters@gmail.com>
parents: 15335
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127 def translate(self, *args):
14109
3148efe5606f Denis S. Otkidach <den@analyt.chem.msu.ru>:
Fred Drake <fdrake@acm.org>
parents: 13516
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128 return self.__class__(self.data.translate(*args))
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a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
parents:
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129 def upper(self): return self.__class__(self.data.upper())
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8b1268bc371a Apply the second version of SF patch http://www.python.org/sf/536241
Walter Dörwald <walter@livinglogic.de>
parents: 23015
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130 def zfill(self, width): return self.__class__(self.data.zfill(width))
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Fred Drake <fdrake@acm.org>
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131
a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
parents:
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132 class MutableString(UserString):
a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
parents:
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133 """mutable string objects
a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
parents:
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134
a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
parents:
diff changeset
135 Python strings are immutable objects. This has the advantage, that
a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
parents:
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136 strings may be used as dictionary keys. If this property isn't needed
a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
parents:
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137 and you insist on changing string values in place instead, you may cheat
a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
parents:
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138 and use MutableString.
a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
parents:
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139
a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
parents:
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140 But the purpose of this class is an educational one: to prevent
a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
parents:
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141 people from inventing their own mutable string class derived
a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
parents:
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142 from UserString and than forget thereby to remove (override) the
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8287f522bea1 Remove a typo. (Or is this some markup I don't understand? ;-)
Thomas Heller <theller@ctypes.org>
parents: 28575
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143 __hash__ method inherited from UserString. This would lead to
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a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
parents:
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144 errors that would be very hard to track down.
a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
parents:
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145
a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
parents:
diff changeset
146 A faster and better solution is to rewrite your program using lists."""
a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
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147 def __init__(self, string=""):
a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
parents:
diff changeset
148 self.data = string
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Tim Peters <tim.peters@gmail.com>
parents: 15335
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149 def __hash__(self):
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a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
parents:
diff changeset
150 raise TypeError, "unhashable type (it is mutable)"
a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
parents:
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151 def __setitem__(self, index, sub):
42951
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Thomas Wouters <thomas@python.org>
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152 if isinstance(index, slice):
9620134010a5 Improve extended slicing support in builtin types and classes. Specifically:
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parents: 38761
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153 if isinstance(sub, UserString):
9620134010a5 Improve extended slicing support in builtin types and classes. Specifically:
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parents: 38761
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154 sub = sub.data
9620134010a5 Improve extended slicing support in builtin types and classes. Specifically:
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parents: 38761
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155 elif not isinstance(sub, basestring):
9620134010a5 Improve extended slicing support in builtin types and classes. Specifically:
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parents: 38761
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156 sub = str(sub)
9620134010a5 Improve extended slicing support in builtin types and classes. Specifically:
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157 start, stop, step = index.indices(len(self.data))
9620134010a5 Improve extended slicing support in builtin types and classes. Specifically:
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parents: 38761
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158 if step == -1:
9620134010a5 Improve extended slicing support in builtin types and classes. Specifically:
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parents: 38761
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159 start, stop = stop+1, start+1
9620134010a5 Improve extended slicing support in builtin types and classes. Specifically:
Thomas Wouters <thomas@python.org>
parents: 38761
diff changeset
160 sub = sub[::-1]
9620134010a5 Improve extended slicing support in builtin types and classes. Specifically:
Thomas Wouters <thomas@python.org>
parents: 38761
diff changeset
161 elif step != 1:
9620134010a5 Improve extended slicing support in builtin types and classes. Specifically:
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parents: 38761
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162 # XXX(twouters): I guess we should be reimplementing
9620134010a5 Improve extended slicing support in builtin types and classes. Specifically:
Thomas Wouters <thomas@python.org>
parents: 38761
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163 # the extended slice assignment/deletion algorithm here...
9620134010a5 Improve extended slicing support in builtin types and classes. Specifically:
Thomas Wouters <thomas@python.org>
parents: 38761
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164 raise TypeError, "invalid step in slicing assignment"
9620134010a5 Improve extended slicing support in builtin types and classes. Specifically:
Thomas Wouters <thomas@python.org>
parents: 38761
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165 start = min(start, stop)
9620134010a5 Improve extended slicing support in builtin types and classes. Specifically:
Thomas Wouters <thomas@python.org>
parents: 38761
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166 self.data = self.data[:start] + sub + self.data[stop:]
9620134010a5 Improve extended slicing support in builtin types and classes. Specifically:
Thomas Wouters <thomas@python.org>
parents: 38761
diff changeset
167 else:
9620134010a5 Improve extended slicing support in builtin types and classes. Specifically:
Thomas Wouters <thomas@python.org>
parents: 38761
diff changeset
168 if index < 0:
9620134010a5 Improve extended slicing support in builtin types and classes. Specifically:
Thomas Wouters <thomas@python.org>
parents: 38761
diff changeset
169 index += len(self.data)
9620134010a5 Improve extended slicing support in builtin types and classes. Specifically:
Thomas Wouters <thomas@python.org>
parents: 38761
diff changeset
170 if index < 0 or index >= len(self.data): raise IndexError
9620134010a5 Improve extended slicing support in builtin types and classes. Specifically:
Thomas Wouters <thomas@python.org>
parents: 38761
diff changeset
171 self.data = self.data[:index] + sub + self.data[index+1:]
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Fred Drake <fdrake@acm.org>
parents:
diff changeset
172 def __delitem__(self, index):
42951
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Thomas Wouters <thomas@python.org>
parents: 38761
diff changeset
173 if isinstance(index, slice):
9620134010a5 Improve extended slicing support in builtin types and classes. Specifically:
Thomas Wouters <thomas@python.org>
parents: 38761
diff changeset
174 start, stop, step = index.indices(len(self.data))
9620134010a5 Improve extended slicing support in builtin types and classes. Specifically:
Thomas Wouters <thomas@python.org>
parents: 38761
diff changeset
175 if step == -1:
9620134010a5 Improve extended slicing support in builtin types and classes. Specifically:
Thomas Wouters <thomas@python.org>
parents: 38761
diff changeset
176 start, stop = stop+1, start+1
9620134010a5 Improve extended slicing support in builtin types and classes. Specifically:
Thomas Wouters <thomas@python.org>
parents: 38761
diff changeset
177 elif step != 1:
9620134010a5 Improve extended slicing support in builtin types and classes. Specifically:
Thomas Wouters <thomas@python.org>
parents: 38761
diff changeset
178 # XXX(twouters): see same block in __setitem__
9620134010a5 Improve extended slicing support in builtin types and classes. Specifically:
Thomas Wouters <thomas@python.org>
parents: 38761
diff changeset
179 raise TypeError, "invalid step in slicing deletion"
9620134010a5 Improve extended slicing support in builtin types and classes. Specifically:
Thomas Wouters <thomas@python.org>
parents: 38761
diff changeset
180 start = min(start, stop)
9620134010a5 Improve extended slicing support in builtin types and classes. Specifically:
Thomas Wouters <thomas@python.org>
parents: 38761
diff changeset
181 self.data = self.data[:start] + self.data[stop:]
9620134010a5 Improve extended slicing support in builtin types and classes. Specifically:
Thomas Wouters <thomas@python.org>
parents: 38761
diff changeset
182 else:
9620134010a5 Improve extended slicing support in builtin types and classes. Specifically:
Thomas Wouters <thomas@python.org>
parents: 38761
diff changeset
183 if index < 0:
9620134010a5 Improve extended slicing support in builtin types and classes. Specifically:
Thomas Wouters <thomas@python.org>
parents: 38761
diff changeset
184 index += len(self.data)
9620134010a5 Improve extended slicing support in builtin types and classes. Specifically:
Thomas Wouters <thomas@python.org>
parents: 38761
diff changeset
185 if index < 0 or index >= len(self.data): raise IndexError
9620134010a5 Improve extended slicing support in builtin types and classes. Specifically:
Thomas Wouters <thomas@python.org>
parents: 38761
diff changeset
186 self.data = self.data[:index] + self.data[index+1:]
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Fred Drake <fdrake@acm.org>
parents:
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187 def __setslice__(self, start, end, sub):
a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
parents:
diff changeset
188 start = max(start, 0); end = max(end, 0)
a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
parents:
diff changeset
189 if isinstance(sub, UserString):
a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
parents:
diff changeset
190 self.data = self.data[:start]+sub.data+self.data[end:]
38761
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Neal Norwitz <nnorwitz@gmail.com>
parents: 38399
diff changeset
191 elif isinstance(sub, basestring):
12214
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Fred Drake <fdrake@acm.org>
parents:
diff changeset
192 self.data = self.data[:start]+sub+self.data[end:]
a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
parents:
diff changeset
193 else:
a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
parents:
diff changeset
194 self.data = self.data[:start]+str(sub)+self.data[end:]
a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
parents:
diff changeset
195 def __delslice__(self, start, end):
a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
parents:
diff changeset
196 start = max(start, 0); end = max(end, 0)
a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
parents:
diff changeset
197 self.data = self.data[:start] + self.data[end:]
a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
parents:
diff changeset
198 def immutable(self):
a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
parents:
diff changeset
199 return UserString(self.data)
24684
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Raymond Hettinger <python@rcn.com>
parents: 24442
diff changeset
200 def __iadd__(self, other):
274e42a691e0 Moved inplace add and multiply methods from UserString to MutableString.
Raymond Hettinger <python@rcn.com>
parents: 24442
diff changeset
201 if isinstance(other, UserString):
274e42a691e0 Moved inplace add and multiply methods from UserString to MutableString.
Raymond Hettinger <python@rcn.com>
parents: 24442
diff changeset
202 self.data += other.data
38761
41570f099a4c Cleanup: Remove import of types to get StringTypes, we can just use basestring.
Neal Norwitz <nnorwitz@gmail.com>
parents: 38399
diff changeset
203 elif isinstance(other, basestring):
24684
274e42a691e0 Moved inplace add and multiply methods from UserString to MutableString.
Raymond Hettinger <python@rcn.com>
parents: 24442
diff changeset
204 self.data += other
274e42a691e0 Moved inplace add and multiply methods from UserString to MutableString.
Raymond Hettinger <python@rcn.com>
parents: 24442
diff changeset
205 else:
274e42a691e0 Moved inplace add and multiply methods from UserString to MutableString.
Raymond Hettinger <python@rcn.com>
parents: 24442
diff changeset
206 self.data += str(other)
274e42a691e0 Moved inplace add and multiply methods from UserString to MutableString.
Raymond Hettinger <python@rcn.com>
parents: 24442
diff changeset
207 return self
274e42a691e0 Moved inplace add and multiply methods from UserString to MutableString.
Raymond Hettinger <python@rcn.com>
parents: 24442
diff changeset
208 def __imul__(self, n):
274e42a691e0 Moved inplace add and multiply methods from UserString to MutableString.
Raymond Hettinger <python@rcn.com>
parents: 24442
diff changeset
209 self.data *= n
274e42a691e0 Moved inplace add and multiply methods from UserString to MutableString.
Raymond Hettinger <python@rcn.com>
parents: 24442
diff changeset
210 return self
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Tim Peters <tim.peters@gmail.com>
parents: 15335
diff changeset
211
12214
a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
parents:
diff changeset
212 if __name__ == "__main__":
a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
parents:
diff changeset
213 # execute the regression test to stdout, if called as a script:
a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
parents:
diff changeset
214 import os
a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
parents:
diff changeset
215 called_in_dir, called_as = os.path.split(sys.argv[0])
a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
parents:
diff changeset
216 called_as, py = os.path.splitext(called_as)
a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
parents:
diff changeset
217 if '-q' in sys.argv:
24442
226ba34bd998 Complete the absolute import patch for the test suite. All relative
Barry Warsaw <barry@python.org>
parents: 23484
diff changeset
218 from test import test_support
12214
a216fe79ae00 UserString class from Peter Funk <pf@artcom-gmbh.de>.
Fred Drake <fdrake@acm.org>
parents:
diff changeset
219 test_support.verbose = 0
24442
226ba34bd998 Complete the absolute import patch for the test suite. All relative
Barry Warsaw <barry@python.org>
parents: 23484
diff changeset
220 __import__('test.test_' + called_as.lower())