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|
"""Class based built-in exception hierarchy.
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.
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 `*'
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
|
+-- 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 EnvironmentError(StandardError):
"""Base class for exceptions that occur outside the Python system.
Primarily used as a base class for OSError and IOError."""
def __init__(self, *args):
self.args = args
self.errno = None
self.strerror = None
self.filename = None
if len(args) == 3:
# open() errors give third argument which is the filename. BUT,
# so common in-place unpacking doesn't break, e.g.:
#
# except IOError, (errno, strerror):
#
# we hack args so that it only contains two items. This also
# means we need our own __str__() which prints out the filename
# when it was supplied.
self.errno, self.strerror, self.filename = args
self.args = args[0:2]
if len(args) == 2:
# common case: PyErr_SetFromErrno()
self.errno, self.strerror = args
def __str__(self):
if self.filename:
return '[Errno %d] %s: %s' % (self.errno, self.strerror,
self.filename)
elif self.errno and self.strerror:
return '[Errno %d] %s' % (self.errno, self.strerror)
else:
return StandardError.__str__(self)
class IOError(EnvironmentError):
pass
class OSError(EnvironmentError):
"""Used by the posix module."""
pass
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
class ArithmeticError(StandardError):
pass
class OverflowError(ArithmeticError):
pass
class FloatingPointError(ArithmeticError):
pass
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
|
