Mercurial > cpython-lru_cache-weakref

annotate Lib/reprlib.py @ 79691:05c8928362ee

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Merge __next__ method link fixes with 3.3.
author Ezio Melotti <ezio.melotti@gmail.com>
date Fri, 12 Oct 2012 13:46:37 +0300
parents 3b81c1eae514
children 8d28d44f3a9a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 """Redo the builtin repr() (representation) but with limits on most sizes."""
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2
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3 __all__ = ["Repr", "repr", "recursive_repr"]
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4
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5 import builtins
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6 from itertools import islice
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7 try:
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8 from _thread import get_ident
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9 except ImportError:
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10 from _dummy_thread import get_ident
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11
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12 def recursive_repr(fillvalue='...'):
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13 'Decorator to make a repr function return fillvalue for a recursive call'
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14
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15 def decorating_function(user_function):
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16 repr_running = set()
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17
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18 def wrapper(self):
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19 key = id(self), get_ident()
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20 if key in repr_running:
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21 return fillvalue
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22 repr_running.add(key)
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23 try:
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24 result = user_function(self)
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25 finally:
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26 repr_running.discard(key)
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27 return result
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29 # Can't use functools.wraps() here because of bootstrap issues
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30 wrapper.__module__ = getattr(user_function, '__module__')
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31 wrapper.__doc__ = getattr(user_function, '__doc__')
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32 wrapper.__name__ = getattr(user_function, '__name__')
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33 wrapper.__annotations__ = getattr(user_function, '__annotations__', {})
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34 return wrapper
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36 return decorating_function
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37
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38 class Repr:
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39
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40 def __init__(self):
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41 self.maxlevel = 6
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42 self.maxtuple = 6
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43 self.maxlist = 6
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44 self.maxarray = 5
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45 self.maxdict = 4
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46 self.maxset = 6
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47 self.maxfrozenset = 6
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48 self.maxdeque = 6
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49 self.maxstring = 30
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50 self.maxlong = 40
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51 self.maxother = 30
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52
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53 def repr(self, x):
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54 return self.repr1(x, self.maxlevel)
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55
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56 def repr1(self, x, level):
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57 typename = type(x).__name__
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58 if ' ' in typename:
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59 parts = typename.split()
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60 typename = '_'.join(parts)
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61 if hasattr(self, 'repr_' + typename):
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62 return getattr(self, 'repr_' + typename)(x, level)
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63 else:
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64 return self.repr_instance(x, level)
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65
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66 def _repr_iterable(self, x, level, left, right, maxiter, trail=''):
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67 n = len(x)
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68 if level <= 0 and n:
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69 s = '...'
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70 else:
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71 newlevel = level - 1
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72 repr1 = self.repr1
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73 pieces = [repr1(elem, newlevel) for elem in islice(x, maxiter)]
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74 if n > maxiter: pieces.append('...')
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75 s = ', '.join(pieces)
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76 if n == 1 and trail: right = trail + right
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77 return '%s%s%s' % (left, s, right)
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78
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79 def repr_tuple(self, x, level):
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80 return self._repr_iterable(x, level, '(', ')', self.maxtuple, ',')
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81
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82 def repr_list(self, x, level):
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83 return self._repr_iterable(x, level, '[', ']', self.maxlist)
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84
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85 def repr_array(self, x, level):
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86 header = "array('%s', [" % x.typecode
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87 return self._repr_iterable(x, level, header, '])', self.maxarray)
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88
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89 def repr_set(self, x, level):
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90 x = _possibly_sorted(x)
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91 return self._repr_iterable(x, level, 'set([', '])', self.maxset)
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92
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93 def repr_frozenset(self, x, level):
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94 x = _possibly_sorted(x)
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95 return self._repr_iterable(x, level, 'frozenset([', '])',
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96 self.maxfrozenset)
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97
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98 def repr_deque(self, x, level):
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99 return self._repr_iterable(x, level, 'deque([', '])', self.maxdeque)
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100
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101 def repr_dict(self, x, level):
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102 n = len(x)
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103 if n == 0: return '{}'
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104 if level <= 0: return '{...}'
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105 newlevel = level - 1
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106 repr1 = self.repr1
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107 pieces = []
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108 for key in islice(_possibly_sorted(x), self.maxdict):
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109 keyrepr = repr1(key, newlevel)
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110 valrepr = repr1(x[key], newlevel)
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111 pieces.append('%s: %s' % (keyrepr, valrepr))
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112 if n > self.maxdict: pieces.append('...')
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113 s = ', '.join(pieces)
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114 return '{%s}' % (s,)
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115
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116 def repr_str(self, x, level):
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117 s = builtins.repr(x[:self.maxstring])
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118 if len(s) > self.maxstring:
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119 i = max(0, (self.maxstring-3)//2)
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120 j = max(0, self.maxstring-3-i)
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121 s = builtins.repr(x[:i] + x[len(x)-j:])
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122 s = s[:i] + '...' + s[len(s)-j:]
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123 return s
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124
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125 def repr_int(self, x, level):
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126 s = builtins.repr(x) # XXX Hope this isn't too slow...
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127 if len(s) > self.maxlong:
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128 i = max(0, (self.maxlong-3)//2)
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129 j = max(0, self.maxlong-3-i)
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130 s = s[:i] + '...' + s[len(s)-j:]
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131 return s
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132
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133 def repr_instance(self, x, level):
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134 try:
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135 s = builtins.repr(x)
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136 # Bugs in x.__repr__() can cause arbitrary
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137 # exceptions -- then make up something
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138 except Exception:
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139 return '<%s instance at %x>' % (x.__class__.__name__, id(x))
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140 if len(s) > self.maxother:
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141 i = max(0, (self.maxother-3)//2)
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142 j = max(0, self.maxother-3-i)
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143 s = s[:i] + '...' + s[len(s)-j:]
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144 return s
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145
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146
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147 def _possibly_sorted(x):
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148 # Since not all sequences of items can be sorted and comparison
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149 # functions may raise arbitrary exceptions, return an unsorted
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150 # sequence in that case.
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151 try:
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152 return sorted(x)
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153 except Exception:
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154 return list(x)
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155
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156 aRepr = Repr()
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157 repr = aRepr.repr