Mercurial > cpython-lru_cache-weakref

annotate Lib/pprint.py @ 44825:ef859cd754a7 legacy-trunk

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Fixed a wrong assumption in configure.in and Include/pyport.h. The is finite function is not called isfinite() but finite(). Sorry, my fault. :)
author Christian Heimes <christian@cheimes.de>
date Sun, 20 Jan 2008 14:28:28 +0000
parents 942e4b42da14
children 6bd4849b5458
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1 # Author: Fred L. Drake, Jr.
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2 # fdrake@acm.org
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3 #
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4 # This is a simple little module I wrote to make life easier. I didn't
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5 # see anything quite like it in the library, though I may have overlooked
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6 # something. I wrote this when I was trying to read some heavily nested
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7 # tuples with fairly non-descriptive content. This is modeled very much
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8 # after Lisp/Scheme - style pretty-printing of lists. If you find it
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9 # useful, thank small children who sleep at night.
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10
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11 """Support to pretty-print lists, tuples, & dictionaries recursively.
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12
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13 Very simple, but useful, especially in debugging data structures.
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14
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15 Classes
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16 -------
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17
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18 PrettyPrinter()
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19 Handle pretty-printing operations onto a stream using a configured
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20 set of formatting parameters.
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21
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22 Functions
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23 ---------
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24
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25 pformat()
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26 Format a Python object into a pretty-printed representation.
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27
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28 pprint()
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29 Pretty-print a Python object to a stream [default is sys.stdout].
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30
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31 saferepr()
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32 Generate a 'standard' repr()-like value, but protect against recursive
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33 data structures.
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34
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35 """
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36
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37 import sys as _sys
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38
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39 from cStringIO import StringIO as _StringIO
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40
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41 __all__ = ["pprint","pformat","isreadable","isrecursive","saferepr",
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42 "PrettyPrinter"]
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43
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44 # cache these for faster access:
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45 _commajoin = ", ".join
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46 _id = id
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47 _len = len
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48 _type = type
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49
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50
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51 def pprint(object, stream=None, indent=1, width=80, depth=None):
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52 """Pretty-print a Python object to a stream [default is sys.stdout]."""
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53 printer = PrettyPrinter(
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54 stream=stream, indent=indent, width=width, depth=depth)
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55 printer.pprint(object)
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56
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57 def pformat(object, indent=1, width=80, depth=None):
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58 """Format a Python object into a pretty-printed representation."""
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59 return PrettyPrinter(indent=indent, width=width, depth=depth).pformat(object)
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60
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61 def saferepr(object):
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62 """Version of repr() which can handle recursive data structures."""
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63 return _safe_repr(object, {}, None, 0)[0]
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64
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65 def isreadable(object):
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66 """Determine if saferepr(object) is readable by eval()."""
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67 return _safe_repr(object, {}, None, 0)[1]
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68
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69 def isrecursive(object):
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70 """Determine if object requires a recursive representation."""
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71 return _safe_repr(object, {}, None, 0)[2]
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72
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73 class PrettyPrinter:
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74 def __init__(self, indent=1, width=80, depth=None, stream=None):
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75 """Handle pretty printing operations onto a stream using a set of
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76 configured parameters.
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77
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78 indent
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79 Number of spaces to indent for each level of nesting.
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80
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81 width
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82 Attempted maximum number of columns in the output.
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83
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84 depth
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85 The maximum depth to print out nested structures.
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86
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87 stream
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88 The desired output stream. If omitted (or false), the standard
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89 output stream available at construction will be used.
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90
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91 """
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92 indent = int(indent)
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93 width = int(width)
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94 assert indent >= 0, "indent must be >= 0"
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95 assert depth is None or depth > 0, "depth must be > 0"
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96 assert width, "width must be != 0"
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97 self._depth = depth
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98 self._indent_per_level = indent
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99 self._width = width
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100 if stream is not None:
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101 self._stream = stream
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102 else:
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103 self._stream = _sys.stdout
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104
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105 def pprint(self, object):
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106 self._format(object, self._stream, 0, 0, {}, 0)
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107 self._stream.write("\n")
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108
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109 def pformat(self, object):
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110 sio = _StringIO()
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111 self._format(object, sio, 0, 0, {}, 0)
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112 return sio.getvalue()
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113
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114 def isrecursive(self, object):
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115 return self.format(object, {}, 0, 0)[2]
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116
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117 def isreadable(self, object):
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118 s, readable, recursive = self.format(object, {}, 0, 0)
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119 return readable and not recursive
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120
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121 def _format(self, object, stream, indent, allowance, context, level):
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122 level = level + 1
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123 objid = _id(object)
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124 if objid in context:
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125 stream.write(_recursion(object))
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126 self._recursive = True
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127 self._readable = False
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128 return
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129 rep = self._repr(object, context, level - 1)
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130 typ = _type(object)
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131 sepLines = _len(rep) > (self._width - 1 - indent - allowance)
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132 write = stream.write
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133
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134 r = getattr(typ, "__repr__", None)
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diff changeset
135 if issubclass(typ, dict) and r is dict.__repr__:
942e4b42da14 #1351692: in pprint, always call format() for dict and list items to enable
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parents: 38546
diff changeset
136 write('{')
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Georg Brandl <georg@python.org>
parents: 38546
diff changeset
137 if self._indent_per_level > 1:
942e4b42da14 #1351692: in pprint, always call format() for dict and list items to enable
Georg Brandl <georg@python.org>
parents: 38546
diff changeset
138 write((self._indent_per_level - 1) * ' ')
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Georg Brandl <georg@python.org>
parents: 38546
diff changeset
139 length = _len(object)
942e4b42da14 #1351692: in pprint, always call format() for dict and list items to enable
Georg Brandl <georg@python.org>
parents: 38546
diff changeset
140 if length:
942e4b42da14 #1351692: in pprint, always call format() for dict and list items to enable
Georg Brandl <georg@python.org>
parents: 38546
diff changeset
141 context[objid] = 1
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parents: 38546
diff changeset
142 indent = indent + self._indent_per_level
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Georg Brandl <georg@python.org>
parents: 38546
diff changeset
143 items = object.items()
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Georg Brandl <georg@python.org>
parents: 38546
diff changeset
144 items.sort()
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Georg Brandl <georg@python.org>
parents: 38546
diff changeset
145 key, ent = items[0]
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parents: 38546
diff changeset
146 rep = self._repr(key, context, level)
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Georg Brandl <georg@python.org>
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diff changeset
147 write(rep)
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Georg Brandl <georg@python.org>
parents: 38546
diff changeset
148 write(': ')
942e4b42da14 #1351692: in pprint, always call format() for dict and list items to enable
Georg Brandl <georg@python.org>
parents: 38546
diff changeset
149 self._format(ent, stream, indent + _len(rep) + 2,
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Georg Brandl <georg@python.org>
parents: 38546
diff changeset
150 allowance + 1, context, level)
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diff changeset
151 if length > 1:
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parents: 38546
diff changeset
152 for key, ent in items[1:]:
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parents: 38546
diff changeset
153 rep = self._repr(key, context, level)
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Georg Brandl <georg@python.org>
parents: 38546
diff changeset
154 if sepLines:
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Barry Warsaw <barry@python.org>
parents: 20967
diff changeset
155 write(',\n%s%s: ' % (' '*indent, rep))
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156 else:
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diff changeset
157 write(', %s: ' % rep)
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diff changeset
158 self._format(ent, stream, indent + _len(rep) + 2,
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diff changeset
159 allowance + 1, context, level)
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parents: 38546
diff changeset
160 indent = indent - self._indent_per_level
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161 del context[objid]
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Georg Brandl <georg@python.org>
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162 write('}')
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parents: 38546
diff changeset
163 return
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parents:
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164
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165 if (issubclass(typ, list) and r is list.__repr__) or \
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166 (issubclass(typ, tuple) and r is tuple.__repr__):
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parents: 38546
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167 if issubclass(typ, list):
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parents: 38546
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168 write('[')
942e4b42da14 #1351692: in pprint, always call format() for dict and list items to enable
Georg Brandl <georg@python.org>
parents: 38546
diff changeset
169 endchar = ']'
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Georg Brandl <georg@python.org>
parents: 38546
diff changeset
170 else:
942e4b42da14 #1351692: in pprint, always call format() for dict and list items to enable
Georg Brandl <georg@python.org>
parents: 38546
diff changeset
171 write('(')
942e4b42da14 #1351692: in pprint, always call format() for dict and list items to enable
Georg Brandl <georg@python.org>
parents: 38546
diff changeset
172 endchar = ')'
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Georg Brandl <georg@python.org>
parents: 38546
diff changeset
173 if self._indent_per_level > 1:
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Georg Brandl <georg@python.org>
parents: 38546
diff changeset
174 write((self._indent_per_level - 1) * ' ')
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Georg Brandl <georg@python.org>
parents: 38546
diff changeset
175 length = _len(object)
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Georg Brandl <georg@python.org>
parents: 38546
diff changeset
176 if length:
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Georg Brandl <georg@python.org>
parents: 38546
diff changeset
177 context[objid] = 1
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Georg Brandl <georg@python.org>
parents: 38546
diff changeset
178 indent = indent + self._indent_per_level
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parents: 38546
diff changeset
179 self._format(object[0], stream, indent, allowance + 1,
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Georg Brandl <georg@python.org>
parents: 38546
diff changeset
180 context, level)
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Georg Brandl <georg@python.org>
parents: 38546
diff changeset
181 if length > 1:
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Georg Brandl <georg@python.org>
parents: 38546
diff changeset
182 for ent in object[1:]:
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Georg Brandl <georg@python.org>
parents: 38546
diff changeset
183 if sepLines:
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diff changeset
184 write(',\n' + ' '*indent)
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diff changeset
185 else:
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Georg Brandl <georg@python.org>
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186 write(', ')
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Georg Brandl <georg@python.org>
parents: 38546
diff changeset
187 self._format(ent, stream, indent,
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diff changeset
188 allowance + 1, context, level)
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Georg Brandl <georg@python.org>
parents: 38546
diff changeset
189 indent = indent - self._indent_per_level
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diff changeset
190 del context[objid]
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Georg Brandl <georg@python.org>
parents: 38546
diff changeset
191 if issubclass(typ, tuple) and length == 1:
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parents: 38546
diff changeset
192 write(',')
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Georg Brandl <georg@python.org>
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diff changeset
193 write(endchar)
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Georg Brandl <georg@python.org>
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diff changeset
194 return
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Georg Brandl <georg@python.org>
parents: 38546
diff changeset
195 write(rep)
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Guido van Rossum <guido@python.org>
parents:
diff changeset
196
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parents:
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197
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e5ecef5a123a Change the "__ private" names to "_ protected"; this has been a pain for
Fred Drake <fdrake@acm.org>
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diff changeset
198 def _repr(self, object, context, level):
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parents: 21061
diff changeset
199 repr, readable, recursive = self.format(object, context.copy(),
24131
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Fred Drake <fdrake@acm.org>
parents: 23622
diff changeset
200 self._depth, level)
7755
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Guido van Rossum <guido@python.org>
parents: 6312
diff changeset
201 if not readable:
24131
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parents: 23622
diff changeset
202 self._readable = False
17820
4bcf88e4abff SF bug[ #423781: pprint.isrecursive() broken.
Tim Peters <tim.peters@gmail.com>
parents: 16562
diff changeset
203 if recursive:
24131
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diff changeset
204 self._recursive = True
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diff changeset
205 return repr
5330
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parents:
diff changeset
206
22766
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diff changeset
207 def format(self, object, context, maxlevels, level):
d26d8575ac62 Add an experimental mechanism to support extending the pprint formatting.
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diff changeset
208 """Format object for a specific context, returning a string
d26d8575ac62 Add an experimental mechanism to support extending the pprint formatting.
Fred Drake <fdrake@acm.org>
parents: 21061
diff changeset
209 and flags indicating whether the representation is 'readable'
d26d8575ac62 Add an experimental mechanism to support extending the pprint formatting.
Fred Drake <fdrake@acm.org>
parents: 21061
diff changeset
210 and whether the object represents a recursive construct.
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Fred Drake <fdrake@acm.org>
parents: 21061
diff changeset
211 """
d26d8575ac62 Add an experimental mechanism to support extending the pprint formatting.
Fred Drake <fdrake@acm.org>
parents: 21061
diff changeset
212 return _safe_repr(object, context, maxlevels, level)
d26d8575ac62 Add an experimental mechanism to support extending the pprint formatting.
Fred Drake <fdrake@acm.org>
parents: 21061
diff changeset
213
d26d8575ac62 Add an experimental mechanism to support extending the pprint formatting.
Fred Drake <fdrake@acm.org>
parents: 21061
diff changeset
214
17820
4bcf88e4abff SF bug[ #423781: pprint.isrecursive() broken.
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parents: 16562
diff changeset
215 # Return triple (repr_string, isreadable, isrecursive).
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parents:
diff changeset
216
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diff changeset
217 def _safe_repr(object, context, maxlevels, level):
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
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parents: 20348
diff changeset
218 typ = _type(object)
29379
347e7b6dfd53 Revert 1.25, as overloaded __repr__ is not considered.
Martin v. Löwis <martin@v.loewis.de>
parents: 29378
diff changeset
219 if typ is str:
26929
ffa4ab37036f - PrettyPrinter.isreadable(), .isrecursive():
Fred Drake <fdrake@acm.org>
parents: 24131
diff changeset
220 if 'locale' not in _sys.modules:
31515
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Walter Dörwald <walter@livinglogic.de>
parents: 31085
diff changeset
221 return repr(object), True, False
19697
bc6bd35f5998 Make pprint more locale-friendly; patch contributed by Denis S. Otkidach.
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parents: 17828
diff changeset
222 if "'" in object and '"' not in object:
bc6bd35f5998 Make pprint more locale-friendly; patch contributed by Denis S. Otkidach.
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parents: 17828
diff changeset
223 closure = '"'
bc6bd35f5998 Make pprint more locale-friendly; patch contributed by Denis S. Otkidach.
Fred Drake <fdrake@acm.org>
parents: 17828
diff changeset
224 quotes = {'"': '\\"'}
bc6bd35f5998 Make pprint more locale-friendly; patch contributed by Denis S. Otkidach.
Fred Drake <fdrake@acm.org>
parents: 17828
diff changeset
225 else:
bc6bd35f5998 Make pprint more locale-friendly; patch contributed by Denis S. Otkidach.
Fred Drake <fdrake@acm.org>
parents: 17828
diff changeset
226 closure = "'"
bc6bd35f5998 Make pprint more locale-friendly; patch contributed by Denis S. Otkidach.
Fred Drake <fdrake@acm.org>
parents: 17828
diff changeset
227 quotes = {"'": "\\'"}
20819
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diff changeset
228 qget = quotes.get
26929
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diff changeset
229 sio = _StringIO()
20819
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diff changeset
230 write = sio.write
19697
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Fred Drake <fdrake@acm.org>
parents: 17828
diff changeset
231 for char in object:
bc6bd35f5998 Make pprint more locale-friendly; patch contributed by Denis S. Otkidach.
Fred Drake <fdrake@acm.org>
parents: 17828
diff changeset
232 if char.isalpha():
20819
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diff changeset
233 write(char)
19697
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Fred Drake <fdrake@acm.org>
parents: 17828
diff changeset
234 else:
31515
71a294bd7950 Replace backticks with repr() or "%r"
Walter Dörwald <walter@livinglogic.de>
parents: 31085
diff changeset
235 write(qget(char, repr(char)[1:-1]))
22867
e2f2187c3d2c Partial introduction of bools where appropriate.
Guido van Rossum <guido@python.org>
parents: 22766
diff changeset
236 return ("%s%s%s" % (closure, sio.getvalue(), closure)), True, False
17828
26745053f840 pprint's workhorse _safe_repr() function took time quadratic in the # of
Tim Peters <tim.peters@gmail.com>
parents: 17820
diff changeset
237
33993
6771e1840bbc Fix pprint to be able to handle objects that don't have a __repr__
Walter Dörwald <walter@livinglogic.de>
parents: 32107
diff changeset
238 r = getattr(typ, "__repr__", None)
31084
e3025fe70d8b Patch #750542: pprint now will pretty print subclasses of list, tuple
Walter Dörwald <walter@livinglogic.de>
parents: 29379
diff changeset
239 if issubclass(typ, dict) and r is dict.__repr__:
20819
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Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
240 if not object:
22867
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Guido van Rossum <guido@python.org>
parents: 22766
diff changeset
241 return "{}", True, False
20819
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Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
242 objid = _id(object)
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
243 if maxlevels and level > maxlevels:
22867
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Guido van Rossum <guido@python.org>
parents: 22766
diff changeset
244 return "{...}", False, objid in context
20819
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parents: 20348
diff changeset
245 if objid in context:
22867
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Guido van Rossum <guido@python.org>
parents: 22766
diff changeset
246 return _recursion(object), False, True
20819
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parents: 20348
diff changeset
247 context[objid] = 1
22867
e2f2187c3d2c Partial introduction of bools where appropriate.
Guido van Rossum <guido@python.org>
parents: 22766
diff changeset
248 readable = True
e2f2187c3d2c Partial introduction of bools where appropriate.
Guido van Rossum <guido@python.org>
parents: 22766
diff changeset
249 recursive = False
17828
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Tim Peters <tim.peters@gmail.com>
parents: 17820
diff changeset
250 components = []
20819
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Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
251 append = components.append
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
252 level += 1
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
253 saferepr = _safe_repr
38546
2eb8be0f8731 pprint functions used to sort a dict (by key) if and only if
Tim Peters <tim.peters@gmail.com>
parents: 35852
diff changeset
254 for k, v in sorted(object.items()):
20819
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Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
255 krepr, kreadable, krecur = saferepr(k, context, maxlevels, level)
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
256 vrepr, vreadable, vrecur = saferepr(v, context, maxlevels, level)
261a70c0aa79 Brute-force performance hackery; buys back about 20% of the time for
Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
257 append("%s: %s" % (krepr, vrepr))
7755
fb4b4d069cc7 Mass check-in after untabifying all files that need it.
Guido van Rossum <guido@python.org>
parents: 6312
diff changeset
258 readable = readable and kreadable and vreadable
20819
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Fred Drake <fdrake@acm.org>
parents: 20348
diff changeset
259 if krecur or vrecur:
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260 recursive = True
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261 del context[objid]
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262 return "{%s}" % _commajoin(components), readable, recursive
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263
31084
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264 if (issubclass(typ, list) and r is list.__repr__) or \
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265 (issubclass(typ, tuple) and r is tuple.__repr__):
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266 if issubclass(typ, list):
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267 if not object:
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268 return "[]", True, False
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269 format = "[%s]"
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270 elif _len(object) == 1:
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271 format = "(%s,)"
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272 else:
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273 if not object:
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274 return "()", True, False
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275 format = "(%s)"
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276 objid = _id(object)
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277 if maxlevels and level > maxlevels:
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278 return format % "...", False, objid in context
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279 if objid in context:
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280 return _recursion(object), False, True
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281 context[objid] = 1
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282 readable = True
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283 recursive = False
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284 components = []
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285 append = components.append
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286 level += 1
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287 for o in object:
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288 orepr, oreadable, orecur = _safe_repr(o, context, maxlevels, level)
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289 append(orepr)
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290 if not oreadable:
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291 readable = False
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292 if orecur:
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293 recursive = True
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294 del context[objid]
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295 return format % _commajoin(components), readable, recursive
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bb8716095a81 Whitespace normalization.
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296
31515
71a294bd7950 Replace backticks with repr() or "%r"
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297 rep = repr(object)
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298 return rep, (rep and not rep.startswith('<')), False
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299
17828
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300
20819
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301 def _recursion(object):
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302 return ("<Recursion on %s with id=%s>"
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303 % (_type(object).__name__, _id(object)))
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304
5330
5a22f9b38aac Checking in a copy of Fred Drake's data structure pretty-printer
Guido van Rossum <guido@python.org>
parents:
diff changeset
305
20819
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306 def _perfcheck(object=None):
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307 import time
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308 if object is None:
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309 object = [("string", (1, 2), [3, 4], {5: 6, 7: 8})] * 100000
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310 p = PrettyPrinter()
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311 t1 = time.time()
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312 _safe_repr(object, {}, None, 0)
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313 t2 = time.time()
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314 p.pformat(object)
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315 t3 = time.time()
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316 print "_safe_repr:", t2 - t1
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317 print "pformat:", t3 - t2
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Guido van Rossum <guido@python.org>
parents:
diff changeset
318
20819
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319 if __name__ == "__main__":
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diff changeset
320 _perfcheck()