Mercurial > cpython-lru_cache-weakref

annotate Lib/exceptions.py @ 8831:00a6bb65ff29 legacy-trunk

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Getting rid of this ancient stuff.
author Guido van Rossum <guido@python.org>
date Wed, 05 Aug 1998 21:10:09 +0000
parents edbf631fb7e9
children 0a6892b1a4ac
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 """Class based built-in exception hierarchy.
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2
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3 This is a new feature whereby all the standard built-in exceptions,
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4 traditionally string objects, are replaced with classes. This gives
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5 Python's exception handling mechanism a more object-oriented feel.
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6
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7 Most existing code should continue to work with class based
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8 exceptions. Some tricky uses of IOError may break, but the most
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9 common uses should work.
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10
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11 To disable this feature, start the Python executable with the -X option.
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12
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13 Here is a rundown of the class hierarchy. You can change this by
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14 editing this file, but it isn't recommended. The classes with a `*'
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15 are new with this feature. They are defined as tuples containing the
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16 derived exceptions when string-based exceptions are used.
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17
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18 Exception(*)
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19 |
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20 +-- StandardError(*)
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21 |
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22 +-- SystemExit
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23 +-- KeyboardInterrupt
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24 +-- ImportError
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25 +-- IOError
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26 +-- EOFError
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27 +-- RuntimeError
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28 +-- NameError
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29 +-- AttributeError
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30 +-- SyntaxError
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31 +-- TypeError
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32 +-- AssertionError
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33 +-- LookupError(*)
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34 | |
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35 | +-- IndexError
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36 | +-- KeyError
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37 |
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38 +-- ArithmeticError(*)
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39 | |
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40 | +-- OverflowError
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41 | +-- ZeroDivisionError
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42 | +-- FloatingPointError
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43 |
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44 +-- ValueError
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45 +-- SystemError
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46 +-- MemoryError
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47 """
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48
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49 class Exception:
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50 def __init__(self, *args):
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51 self.args = args
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52
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53 def __str__(self):
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54 if not self.args:
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55 return ''
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56 elif len(self.args) == 1:
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57 return str(self.args[0])
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58 else:
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59 return str(self.args)
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60
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61 def __getitem__(self, i):
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62 return self.args[i]
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63
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64 class StandardError(Exception):
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65 pass
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66
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67 class SyntaxError(StandardError):
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68 filename = lineno = offset = text = None
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69 msg = ""
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70 def __init__(self, *args):
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71 self.args = args
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72 if len(self.args) >= 1:
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73 self.msg = self.args[0]
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74 if len(self.args) == 2:
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75 info = self.args[1]
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76 try:
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77 self.filename, self.lineno, self.offset, self.text = info
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78 except:
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79 pass
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80 def __str__(self):
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81 return str(self.msg)
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82
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83 class EnvironmentError(StandardError):
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84 """Base class for exceptions that occur outside the Python system.
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85 Primarily used as a base class for OSError and IOError."""
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86 def __init__(self, *args):
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87 self.args = args
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88 self.errno = None
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89 self.strerror = None
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90 self.filename = None
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91 if len(args) == 3:
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92 # open() errors give third argument which is the filename. BUT,
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93 # so common in-place unpacking doesn't break, e.g.:
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94 #
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95 # except IOError, (errno, strerror):
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96 #
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97 # we hack args so that it only contains two items. This also
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98 # means we need our own __str__() which prints out the filename
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99 # when it was supplied.
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100 self.errno, self.strerror, self.filename = args
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101 self.args = args[0:2]
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102 if len(args) == 2:
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103 # common case: PyErr_SetFromErrno()
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104 self.errno, self.strerror = args
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105
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106 def __str__(self):
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107 if self.filename:
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108 return '[Errno %s] %s: %s' % (self.errno, self.strerror,
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109 self.filename)
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110 elif self.errno and self.strerror:
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111 return '[Errno %s] %s' % (self.errno, self.strerror)
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112 else:
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113 return StandardError.__str__(self)
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114
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115 class IOError(EnvironmentError):
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116 pass
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117
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118 class OSError(EnvironmentError):
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119 """Used by the posix module."""
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120 pass
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121
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122 class RuntimeError(StandardError):
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123 pass
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124
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125 class SystemError(StandardError):
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126 pass
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127
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128 class EOFError(StandardError):
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129 pass
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130
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131 class ImportError(StandardError):
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132 pass
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133
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134 class TypeError(StandardError):
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135 pass
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136
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137 class ValueError(StandardError):
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138 pass
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139
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140 class KeyboardInterrupt(StandardError):
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141 pass
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142
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143 class AssertionError(StandardError):
d97980e7c05f New file, which is imported by the built-in module when python is
Barry Warsaw <barry@python.org>
parents:
diff changeset
144 pass
d97980e7c05f New file, which is imported by the built-in module when python is
Barry Warsaw <barry@python.org>
parents:
diff changeset
145
6325
5cdc3ca053d6 NumberError => ArithmeticError
Barry Warsaw <barry@python.org>
parents: 6317
diff changeset
146 class ArithmeticError(StandardError):
6195
d97980e7c05f New file, which is imported by the built-in module when python is
Barry Warsaw <barry@python.org>
parents:
diff changeset
147 pass
d97980e7c05f New file, which is imported by the built-in module when python is
Barry Warsaw <barry@python.org>
parents:
diff changeset
148
6325
5cdc3ca053d6 NumberError => ArithmeticError
Barry Warsaw <barry@python.org>
parents: 6317
diff changeset
149 class OverflowError(ArithmeticError):
6195
d97980e7c05f New file, which is imported by the built-in module when python is
Barry Warsaw <barry@python.org>
parents:
diff changeset
150 pass
d97980e7c05f New file, which is imported by the built-in module when python is
Barry Warsaw <barry@python.org>
parents:
diff changeset
151
6325
5cdc3ca053d6 NumberError => ArithmeticError
Barry Warsaw <barry@python.org>
parents: 6317
diff changeset
152 class FloatingPointError(ArithmeticError):
6195
d97980e7c05f New file, which is imported by the built-in module when python is
Barry Warsaw <barry@python.org>
parents:
diff changeset
153 pass
d97980e7c05f New file, which is imported by the built-in module when python is
Barry Warsaw <barry@python.org>
parents:
diff changeset
154
6325
5cdc3ca053d6 NumberError => ArithmeticError
Barry Warsaw <barry@python.org>
parents: 6317
diff changeset
155 class ZeroDivisionError(ArithmeticError):
6195
d97980e7c05f New file, which is imported by the built-in module when python is
Barry Warsaw <barry@python.org>
parents:
diff changeset
156 pass
d97980e7c05f New file, which is imported by the built-in module when python is
Barry Warsaw <barry@python.org>
parents:
diff changeset
157
d97980e7c05f New file, which is imported by the built-in module when python is
Barry Warsaw <barry@python.org>
parents:
diff changeset
158 class LookupError(StandardError):
d97980e7c05f New file, which is imported by the built-in module when python is
Barry Warsaw <barry@python.org>
parents:
diff changeset
159 pass
d97980e7c05f New file, which is imported by the built-in module when python is
Barry Warsaw <barry@python.org>
parents:
diff changeset
160
d97980e7c05f New file, which is imported by the built-in module when python is
Barry Warsaw <barry@python.org>
parents:
diff changeset
161 class IndexError(LookupError):
d97980e7c05f New file, which is imported by the built-in module when python is
Barry Warsaw <barry@python.org>
parents:
diff changeset
162 pass
d97980e7c05f New file, which is imported by the built-in module when python is
Barry Warsaw <barry@python.org>
parents:
diff changeset
163
d97980e7c05f New file, which is imported by the built-in module when python is
Barry Warsaw <barry@python.org>
parents:
diff changeset
164 class KeyError(LookupError):
d97980e7c05f New file, which is imported by the built-in module when python is
Barry Warsaw <barry@python.org>
parents:
diff changeset
165 pass
d97980e7c05f New file, which is imported by the built-in module when python is
Barry Warsaw <barry@python.org>
parents:
diff changeset
166
d97980e7c05f New file, which is imported by the built-in module when python is
Barry Warsaw <barry@python.org>
parents:
diff changeset
167 class AttributeError(StandardError):
d97980e7c05f New file, which is imported by the built-in module when python is
Barry Warsaw <barry@python.org>
parents:
diff changeset
168 pass
d97980e7c05f New file, which is imported by the built-in module when python is
Barry Warsaw <barry@python.org>
parents:
diff changeset
169
d97980e7c05f New file, which is imported by the built-in module when python is
Barry Warsaw <barry@python.org>
parents:
diff changeset
170 class NameError(StandardError):
d97980e7c05f New file, which is imported by the built-in module when python is
Barry Warsaw <barry@python.org>
parents:
diff changeset
171 pass
d97980e7c05f New file, which is imported by the built-in module when python is
Barry Warsaw <barry@python.org>
parents:
diff changeset
172
d97980e7c05f New file, which is imported by the built-in module when python is
Barry Warsaw <barry@python.org>
parents:
diff changeset
173 class MemoryError(StandardError):
d97980e7c05f New file, which is imported by the built-in module when python is
Barry Warsaw <barry@python.org>
parents:
diff changeset
174 pass
6317
71b40cc4cc03 Two subtle changes:
Guido van Rossum <guido@python.org>
parents: 6272
diff changeset
175
71b40cc4cc03 Two subtle changes:
Guido van Rossum <guido@python.org>
parents: 6272
diff changeset
176 class SystemExit(Exception):
71b40cc4cc03 Two subtle changes:
Guido van Rossum <guido@python.org>
parents: 6272
diff changeset
177 def __init__(self, *args):
7755
fb4b4d069cc7 Mass check-in after untabifying all files that need it.
Guido van Rossum <guido@python.org>
parents: 6394
diff changeset
178 self.args = args
6317
71b40cc4cc03 Two subtle changes:
Guido van Rossum <guido@python.org>
parents: 6272
diff changeset
179 if len(args) == 0:
71b40cc4cc03 Two subtle changes:
Guido van Rossum <guido@python.org>
parents: 6272
diff changeset
180 self.code = None
71b40cc4cc03 Two subtle changes:
Guido van Rossum <guido@python.org>
parents: 6272
diff changeset
181 elif len(args) == 1:
71b40cc4cc03 Two subtle changes:
Guido van Rossum <guido@python.org>
parents: 6272
diff changeset
182 self.code = args[0]
71b40cc4cc03 Two subtle changes:
Guido van Rossum <guido@python.org>
parents: 6272
diff changeset
183 else:
71b40cc4cc03 Two subtle changes:
Guido van Rossum <guido@python.org>
parents: 6272
diff changeset
184 self.code = args