cpython/Lib/exceptions.py

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"""Class based built-in exception hierarchy.
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This is a new feature whereby all the standard built-in exceptions,
traditionally string objects, are replaced with classes. This gives
Python's exception handling mechanism a more object-oriented feel.
Most existing code should continue to work with class based
exceptions. Some tricky uses of IOError may break, but the most
common uses should work.
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To disable this feature, start the Python executable with the -X option.
Here is a rundown of the class hierarchy. You can change this by
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
derived exceptions when string-based exceptions are used.
Exception(*)
|
+-- StandardError(*)
|
+-- SystemExit
+-- KeyboardInterrupt
+-- ImportError
+-- IOError
+-- EOFError
+-- RuntimeError
+-- NameError
+-- AttributeError
+-- SyntaxError
+-- TypeError
+-- AssertionError
+-- LookupError(*)
| |
| +-- IndexError
| +-- KeyError
|
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+-- ArithmeticError(*)
| |
| +-- OverflowError
| +-- ZeroDivisionError
| +-- FloatingPointError
|
+-- ValueError
+-- SystemError
+-- MemoryError
"""
class Exception:
def __init__(self, *args):
self.args = args
def __str__(self):
if not self.args:
return ''
elif len(self.args) == 1:
return str(self.args[0])
else:
return str(self.args)
def __getitem__(self, i):
return self.args[i]
class StandardError(Exception):
pass
class SyntaxError(StandardError):
filename = lineno = offset = text = None
msg = ""
def __init__(self, *args):
self.args = args
if len(self.args) >= 1:
self.msg = self.args[0]
if len(self.args) == 2:
info = self.args[1]
try:
self.filename, self.lineno, self.offset, self.text = info
except:
pass
def __str__(self):
return str(self.msg)
class IOError(StandardError):
def __init__(self, *args):
self.args = args
self.errno = None
self.strerror = None
if len(args) == 2:
# common case: PyErr_SetFromErrno()
self.errno = args[0]
self.strerror = args[1]
class RuntimeError(StandardError):
pass
class SystemError(StandardError):
pass
class EOFError(StandardError):
pass
class ImportError(StandardError):
pass
class TypeError(StandardError):
pass
class ValueError(StandardError):
pass
class KeyboardInterrupt(StandardError):
pass
class AssertionError(StandardError):
pass
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class ArithmeticError(StandardError):
pass
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class OverflowError(ArithmeticError):
pass
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class FloatingPointError(ArithmeticError):
pass
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class ZeroDivisionError(ArithmeticError):
pass
class LookupError(StandardError):
pass
class IndexError(LookupError):
pass
class KeyError(LookupError):
pass
class AttributeError(StandardError):
pass
class NameError(StandardError):
pass
class MemoryError(StandardError):
pass
class SystemExit(Exception):
def __init__(self, *args):
self.args = args
if len(args) == 0:
self.code = None
elif len(args) == 1:
self.code = args[0]
else:
self.code = args