185 lines
4.6 KiB
Python
185 lines
4.6 KiB
Python
"""Class based built-in exception hierarchy.
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This is a new feature whereby all the standard built-in exceptions,
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traditionally string objects, are replaced with classes. This gives
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Python's exception handling mechanism a more object-oriented feel.
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Most existing code should continue to work with class based
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exceptions. Some tricky uses of IOError may break, but the most
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common uses should work.
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To disable this feature, start the Python executable with the -X option.
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Here is a rundown of the class hierarchy. You can change this by
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editing this file, but it isn't recommended. The classes with a `*'
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are new with this feature. They are defined as tuples containing the
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derived exceptions when string-based exceptions are used.
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Exception(*)
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+-- StandardError(*)
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+-- SystemExit
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+-- KeyboardInterrupt
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+-- ImportError
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+-- IOError
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+-- EOFError
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+-- RuntimeError
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+-- NameError
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+-- AttributeError
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+-- SyntaxError
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+-- TypeError
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+-- AssertionError
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+-- LookupError(*)
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| |
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| +-- IndexError
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| +-- KeyError
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+-- ArithmeticError(*)
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| +-- OverflowError
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| +-- ZeroDivisionError
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| +-- FloatingPointError
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+-- ValueError
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+-- SystemError
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+-- MemoryError
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"""
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class Exception:
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def __init__(self, *args):
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self.args = args
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def __str__(self):
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if not self.args:
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return ''
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elif len(self.args) == 1:
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return str(self.args[0])
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else:
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return str(self.args)
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def __getitem__(self, i):
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return self.args[i]
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class StandardError(Exception):
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pass
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class SyntaxError(StandardError):
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filename = lineno = offset = text = None
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msg = ""
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def __init__(self, *args):
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self.args = args
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if len(self.args) >= 1:
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self.msg = self.args[0]
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if len(self.args) == 2:
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info = self.args[1]
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try:
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self.filename, self.lineno, self.offset, self.text = info
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except:
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pass
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def __str__(self):
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return str(self.msg)
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class EnvironmentError(StandardError):
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"""Base class for exceptions that occur outside the Python system.
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Primarily used as a base class for OSError and IOError."""
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def __init__(self, *args):
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self.args = args
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self.errno = None
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self.strerror = None
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self.filename = None
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if len(args) == 3:
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# open() errors give third argument which is the filename. BUT,
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# so common in-place unpacking doesn't break, e.g.:
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#
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# except IOError, (errno, strerror):
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#
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# we hack args so that it only contains two items. This also
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# means we need our own __str__() which prints out the filename
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# when it was supplied.
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self.errno, self.strerror, self.filename = args
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self.args = args[0:2]
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if len(args) == 2:
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# common case: PyErr_SetFromErrno()
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self.errno, self.strerror = args
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def __str__(self):
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if self.filename is not None:
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return '[Errno %s] %s: %s' % (self.errno, self.strerror,
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repr(self.filename))
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elif self.errno and self.strerror:
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return '[Errno %s] %s' % (self.errno, self.strerror)
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else:
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return StandardError.__str__(self)
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class IOError(EnvironmentError):
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pass
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class OSError(EnvironmentError):
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"""Used by the posix module."""
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pass
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class RuntimeError(StandardError):
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pass
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class SystemError(StandardError):
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pass
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class EOFError(StandardError):
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pass
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class ImportError(StandardError):
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pass
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class TypeError(StandardError):
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pass
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class ValueError(StandardError):
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pass
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class KeyboardInterrupt(StandardError):
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pass
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class AssertionError(StandardError):
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pass
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class ArithmeticError(StandardError):
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pass
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class OverflowError(ArithmeticError):
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pass
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class FloatingPointError(ArithmeticError):
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pass
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class ZeroDivisionError(ArithmeticError):
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pass
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class LookupError(StandardError):
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pass
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class IndexError(LookupError):
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pass
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class KeyError(LookupError):
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pass
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class AttributeError(StandardError):
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pass
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class NameError(StandardError):
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pass
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class MemoryError(StandardError):
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pass
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class SystemExit(Exception):
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def __init__(self, *args):
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self.args = args
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if len(args) == 0:
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self.code = None
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elif len(args) == 1:
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self.code = args[0]
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else:
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self.code = args
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