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Title: Built-in Exceptions — Python 3.14.2 documentation

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Description: In Python, all exceptions must be instances of a class that derives from BaseException. In a try statement with an except clause that mentions a particular class, that clause also handles any excep...

Open Graph Description: In Python, all exceptions must be instances of a class that derives from BaseException. In a try statement with an except clause that mentions a particular class, that clause also handles any excep...

Opengraph URL: https://docs.python.org/3/library/exceptions.html

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Links:

	https://www.python.org/
Table of Contents	https://docs.python.org/contents.html
Built-in Exceptions	https://docs.python.org/library/exceptions.html
Exception context	https://docs.python.org/library/exceptions.html#exception-context
Inheriting from built-in exceptions	https://docs.python.org/library/exceptions.html#inheriting-from-built-in-exceptions
Base classes	https://docs.python.org/library/exceptions.html#base-classes
Concrete exceptions	https://docs.python.org/library/exceptions.html#concrete-exceptions
OS exceptions	https://docs.python.org/library/exceptions.html#os-exceptions
Warnings	https://docs.python.org/library/exceptions.html#warnings
Exception groups	https://docs.python.org/library/exceptions.html#exception-groups
Exception hierarchy	https://docs.python.org/library/exceptions.html#exception-hierarchy
Built-in Types	https://docs.python.org/library/stdtypes.html
Text Processing Services	https://docs.python.org/library/text.html
Report a bug	https://docs.python.org/bugs.html
Show source	https://github.com/python/cpython/blob/main/Doc/library/exceptions.rst?plain=1
index	https://docs.python.org/genindex.html
modules	https://docs.python.org/py-modindex.html
next	https://docs.python.org/library/text.html
previous	https://docs.python.org/library/stdtypes.html
Python	https://www.python.org/
3.14.2 Documentation	https://docs.python.org/index.html
The Python Standard Library	https://docs.python.org/library/index.html
Built-in Exceptions	https://docs.python.org/library/exceptions.html
¶	https://docs.python.org/library/exceptions.html#built-in-exceptions
BaseException	https://docs.python.org/library/exceptions.html#BaseException
try	https://docs.python.org/reference/compound_stmts.html#try
except	https://docs.python.org/reference/compound_stmts.html#except
Exception	https://docs.python.org/library/exceptions.html#Exception
BaseException	https://docs.python.org/library/exceptions.html#BaseException
User-defined Exceptions	https://docs.python.org/tutorial/errors.html#tut-userexceptions
¶	https://docs.python.org/library/exceptions.html#exception-context
¶	https://docs.python.org/library/exceptions.html#BaseException.__context__
¶	https://docs.python.org/library/exceptions.html#BaseException.__cause__
¶	https://docs.python.org/library/exceptions.html#BaseException.__suppress_context__
except	https://docs.python.org/reference/compound_stmts.html#except
finally	https://docs.python.org/reference/compound_stmts.html#finally
with	https://docs.python.org/reference/compound_stmts.html#with
raise	https://docs.python.org/reference/simple_stmts.html#raise
from	https://docs.python.org/reference/simple_stmts.html#raise
KeyError	https://docs.python.org/library/exceptions.html#KeyError
AttributeError	https://docs.python.org/library/exceptions.html#AttributeError
None	https://docs.python.org/library/constants.html#None
¶	https://docs.python.org/library/exceptions.html#inheriting-from-built-in-exceptions
Objects/exceptions.c	https://github.com/python/cpython/tree/3.14/Objects/exceptions.c
¶	https://docs.python.org/library/exceptions.html#base-classes
¶	https://docs.python.org/library/exceptions.html#BaseException
Exception	https://docs.python.org/library/exceptions.html#Exception
str()	https://docs.python.org/library/stdtypes.html#str
¶	https://docs.python.org/library/exceptions.html#BaseException.args
OSError	https://docs.python.org/library/exceptions.html#OSError
¶	https://docs.python.org/library/exceptions.html#BaseException.with_traceback
PEP 3134	https://peps.python.org/pep-3134/
¶	https://docs.python.org/library/exceptions.html#BaseException.__traceback__
traceback object	https://docs.python.org/reference/datamodel.html#traceback-objects
The raise statement	https://docs.python.org/reference/simple_stmts.html#raise
¶	https://docs.python.org/library/exceptions.html#BaseException.add_note
TypeError	https://docs.python.org/library/exceptions.html#TypeError
¶	https://docs.python.org/library/exceptions.html#BaseException.__notes__
add_note()	https://docs.python.org/library/exceptions.html#BaseException.add_note
add_note()	https://docs.python.org/library/exceptions.html#BaseException.add_note
¶	https://docs.python.org/library/exceptions.html#Exception
¶	https://docs.python.org/library/exceptions.html#ArithmeticError
OverflowError	https://docs.python.org/library/exceptions.html#OverflowError
ZeroDivisionError	https://docs.python.org/library/exceptions.html#ZeroDivisionError
FloatingPointError	https://docs.python.org/library/exceptions.html#FloatingPointError
¶	https://docs.python.org/library/exceptions.html#BufferError
buffer	https://docs.python.org/c-api/buffer.html#bufferobjects
¶	https://docs.python.org/library/exceptions.html#LookupError
IndexError	https://docs.python.org/library/exceptions.html#IndexError
KeyError	https://docs.python.org/library/exceptions.html#KeyError
codecs.lookup()	https://docs.python.org/library/codecs.html#codecs.lookup
¶	https://docs.python.org/library/exceptions.html#concrete-exceptions
¶	https://docs.python.org/library/exceptions.html#AssertionError
assert	https://docs.python.org/reference/simple_stmts.html#assert
¶	https://docs.python.org/library/exceptions.html#AttributeError
Attribute references	https://docs.python.org/reference/expressions.html#attribute-references
TypeError	https://docs.python.org/library/exceptions.html#TypeError
¶	https://docs.python.org/library/exceptions.html#AttributeError.name
¶	https://docs.python.org/library/exceptions.html#AttributeError.obj
name	https://docs.python.org/library/exceptions.html#AttributeError.name
obj	https://docs.python.org/library/exceptions.html#AttributeError.obj
¶	https://docs.python.org/library/exceptions.html#EOFError
input()	https://docs.python.org/library/functions.html#input
io.IOBase.readline()	https://docs.python.org/library/io.html#io.IOBase.readline
¶	https://docs.python.org/library/exceptions.html#FloatingPointError
¶	https://docs.python.org/library/exceptions.html#GeneratorExit
generator	https://docs.python.org/glossary.html#term-generator
coroutine	https://docs.python.org/glossary.html#term-coroutine
generator.close()	https://docs.python.org/reference/expressions.html#generator.close
coroutine.close()	https://docs.python.org/reference/datamodel.html#coroutine.close
BaseException	https://docs.python.org/library/exceptions.html#BaseException
Exception	https://docs.python.org/library/exceptions.html#Exception
¶	https://docs.python.org/library/exceptions.html#ImportError
import	https://docs.python.org/reference/simple_stmts.html#import
¶	https://docs.python.org/library/exceptions.html#ImportError.name
¶	https://docs.python.org/library/exceptions.html#ImportError.path
name	https://docs.python.org/library/exceptions.html#ImportError.name
path	https://docs.python.org/library/exceptions.html#ImportError.path
¶	https://docs.python.org/library/exceptions.html#ModuleNotFoundError
ImportError	https://docs.python.org/library/exceptions.html#ImportError
import	https://docs.python.org/reference/simple_stmts.html#import
sys.modules	https://docs.python.org/library/sys.html#sys.modules
¶	https://docs.python.org/library/exceptions.html#IndexError
TypeError	https://docs.python.org/library/exceptions.html#TypeError
¶	https://docs.python.org/library/exceptions.html#KeyError
¶	https://docs.python.org/library/exceptions.html#KeyboardInterrupt
BaseException	https://docs.python.org/library/exceptions.html#BaseException
Exception	https://docs.python.org/library/exceptions.html#Exception
KeyboardInterrupt	https://docs.python.org/library/exceptions.html#KeyboardInterrupt
KeyboardInterrupt	https://docs.python.org/library/exceptions.html#KeyboardInterrupt
Note on Signal Handlers and Exceptions	https://docs.python.org/library/signal.html#handlers-and-exceptions
¶	https://docs.python.org/library/exceptions.html#MemoryError
¶	https://docs.python.org/library/exceptions.html#NameError
¶	https://docs.python.org/library/exceptions.html#NameError.name
name	https://docs.python.org/library/exceptions.html#NameError.name
¶	https://docs.python.org/library/exceptions.html#NotImplementedError
RuntimeError	https://docs.python.org/library/exceptions.html#RuntimeError
None	https://docs.python.org/library/constants.html#None
NotImplemented	https://docs.python.org/library/constants.html#NotImplemented
¶	https://docs.python.org/library/exceptions.html#OSError
None	https://docs.python.org/library/constants.html#None
args	https://docs.python.org/library/exceptions.html#BaseException.args
OSError	https://docs.python.org/library/exceptions.html#OSError
OS exceptions	https://docs.python.org/library/exceptions.html#os-exceptions
errno	https://docs.python.org/library/exceptions.html#OSError.errno
OSError	https://docs.python.org/library/exceptions.html#OSError
¶	https://docs.python.org/library/exceptions.html#OSError.errno
¶	https://docs.python.org/library/exceptions.html#OSError.winerror
errno	https://docs.python.org/library/exceptions.html#OSError.errno
errno	https://docs.python.org/library/exceptions.html#OSError.errno
winerror	https://docs.python.org/library/exceptions.html#OSError.winerror
¶	https://docs.python.org/library/exceptions.html#OSError.strerror
¶	https://docs.python.org/library/exceptions.html#OSError.filename
¶	https://docs.python.org/library/exceptions.html#OSError.filename2
open()	https://docs.python.org/library/functions.html#open
os.unlink()	https://docs.python.org/library/os.html#os.unlink
filename	https://docs.python.org/library/exceptions.html#OSError.filename
os.rename()	https://docs.python.org/library/os.html#os.rename
filename2	https://docs.python.org/library/exceptions.html#OSError.filename2
EnvironmentError	https://docs.python.org/library/exceptions.html#EnvironmentError
IOError	https://docs.python.org/library/exceptions.html#IOError
WindowsError	https://docs.python.org/library/exceptions.html#WindowsError
socket.error	https://docs.python.org/library/socket.html#socket.error
select.error	https://docs.python.org/library/select.html#select.error
OSError	https://docs.python.org/library/exceptions.html#OSError
filename	https://docs.python.org/library/exceptions.html#OSError.filename
filesystem encoding and error handler	https://docs.python.org/glossary.html#term-filesystem-encoding-and-error-handler
¶	https://docs.python.org/library/exceptions.html#OverflowError
MemoryError	https://docs.python.org/library/exceptions.html#MemoryError
¶	https://docs.python.org/library/exceptions.html#PythonFinalizationError
RuntimeError	https://docs.python.org/library/exceptions.html#RuntimeError
Python finalization	https://docs.python.org/glossary.html#term-interpreter-shutdown
PythonFinalizationError	https://docs.python.org/library/exceptions.html#PythonFinalizationError
Joining	https://docs.python.org/library/threading.html#threading.Thread.join
os.fork()	https://docs.python.org/library/os.html#os.fork
sys.is_finalizing()	https://docs.python.org/library/sys.html#sys.is_finalizing
RuntimeError	https://docs.python.org/library/exceptions.html#RuntimeError
threading.Thread.join()	https://docs.python.org/library/threading.html#threading.Thread.join
¶	https://docs.python.org/library/exceptions.html#RecursionError
RuntimeError	https://docs.python.org/library/exceptions.html#RuntimeError
sys.getrecursionlimit()	https://docs.python.org/library/sys.html#sys.getrecursionlimit
RuntimeError	https://docs.python.org/library/exceptions.html#RuntimeError
¶	https://docs.python.org/library/exceptions.html#ReferenceError
weakref.proxy()	https://docs.python.org/library/weakref.html#weakref.proxy
weakref	https://docs.python.org/library/weakref.html#module-weakref
¶	https://docs.python.org/library/exceptions.html#RuntimeError
¶	https://docs.python.org/library/exceptions.html#StopIteration
next()	https://docs.python.org/library/functions.html#next
iterator	https://docs.python.org/glossary.html#term-iterator
__next__()	https://docs.python.org/library/stdtypes.html#iterator.__next__
¶	https://docs.python.org/library/exceptions.html#StopIteration.value
None	https://docs.python.org/library/constants.html#None
generator	https://docs.python.org/glossary.html#term-generator
coroutine	https://docs.python.org/glossary.html#term-coroutine
StopIteration	https://docs.python.org/library/exceptions.html#StopIteration
value	https://docs.python.org/library/exceptions.html#StopIteration.value
StopIteration	https://docs.python.org/library/exceptions.html#StopIteration
RuntimeError	https://docs.python.org/library/exceptions.html#RuntimeError
StopIteration	https://docs.python.org/library/exceptions.html#StopIteration
PEP 479	https://peps.python.org/pep-0479/
PEP 479	https://peps.python.org/pep-0479/
StopIteration	https://docs.python.org/library/exceptions.html#StopIteration
RuntimeError	https://docs.python.org/library/exceptions.html#RuntimeError
¶	https://docs.python.org/library/exceptions.html#StopAsyncIteration
__anext__()	https://docs.python.org/reference/datamodel.html#object.__anext__
asynchronous iterator	https://docs.python.org/glossary.html#term-asynchronous-iterator
¶	https://docs.python.org/library/exceptions.html#SyntaxError
import	https://docs.python.org/reference/simple_stmts.html#import
compile()	https://docs.python.org/library/functions.html#compile
exec()	https://docs.python.org/library/functions.html#exec
eval()	https://docs.python.org/library/functions.html#eval
str()	https://docs.python.org/library/stdtypes.html#str
¶	https://docs.python.org/library/exceptions.html#SyntaxError.filename
¶	https://docs.python.org/library/exceptions.html#SyntaxError.lineno
¶	https://docs.python.org/library/exceptions.html#SyntaxError.offset
¶	https://docs.python.org/library/exceptions.html#SyntaxError.text
¶	https://docs.python.org/library/exceptions.html#SyntaxError.end_lineno
¶	https://docs.python.org/library/exceptions.html#SyntaxError.end_offset
end_lineno	https://docs.python.org/library/exceptions.html#SyntaxError.end_lineno
end_offset	https://docs.python.org/library/exceptions.html#SyntaxError.end_offset
¶	https://docs.python.org/library/exceptions.html#IndentationError
SyntaxError	https://docs.python.org/library/exceptions.html#SyntaxError
¶	https://docs.python.org/library/exceptions.html#TabError
IndentationError	https://docs.python.org/library/exceptions.html#IndentationError
¶	https://docs.python.org/library/exceptions.html#SystemError
CPython	https://docs.python.org/glossary.html#term-CPython
¶	https://docs.python.org/library/exceptions.html#SystemExit
sys.exit()	https://docs.python.org/library/sys.html#sys.exit
BaseException	https://docs.python.org/library/exceptions.html#BaseException
Exception	https://docs.python.org/library/exceptions.html#Exception
Exception	https://docs.python.org/library/exceptions.html#Exception
sys.exit()	https://docs.python.org/library/sys.html#sys.exit
sys.exit()	https://docs.python.org/library/sys.html#sys.exit
finally	https://docs.python.org/reference/compound_stmts.html#finally
try	https://docs.python.org/reference/compound_stmts.html#try
os._exit()	https://docs.python.org/library/os.html#os._exit
os.fork()	https://docs.python.org/library/os.html#os.fork
¶	https://docs.python.org/library/exceptions.html#SystemExit.code
¶	https://docs.python.org/library/exceptions.html#TypeError
NotImplementedError	https://docs.python.org/library/exceptions.html#NotImplementedError
list	https://docs.python.org/library/stdtypes.html#list
int	https://docs.python.org/library/functions.html#int
TypeError	https://docs.python.org/library/exceptions.html#TypeError
ValueError	https://docs.python.org/library/exceptions.html#ValueError
¶	https://docs.python.org/library/exceptions.html#UnboundLocalError
NameError	https://docs.python.org/library/exceptions.html#NameError
¶	https://docs.python.org/library/exceptions.html#UnicodeError
ValueError	https://docs.python.org/library/exceptions.html#ValueError
UnicodeError	https://docs.python.org/library/exceptions.html#UnicodeError
¶	https://docs.python.org/library/exceptions.html#UnicodeError.encoding
¶	https://docs.python.org/library/exceptions.html#UnicodeError.reason
¶	https://docs.python.org/library/exceptions.html#UnicodeError.object
¶	https://docs.python.org/library/exceptions.html#UnicodeError.start
object	https://docs.python.org/library/functions.html#object
¶	https://docs.python.org/library/exceptions.html#UnicodeError.end
object	https://docs.python.org/library/functions.html#object
¶	https://docs.python.org/library/exceptions.html#UnicodeEncodeError
UnicodeError	https://docs.python.org/library/exceptions.html#UnicodeError
¶	https://docs.python.org/library/exceptions.html#UnicodeDecodeError
UnicodeError	https://docs.python.org/library/exceptions.html#UnicodeError
¶	https://docs.python.org/library/exceptions.html#UnicodeTranslateError
UnicodeError	https://docs.python.org/library/exceptions.html#UnicodeError
¶	https://docs.python.org/library/exceptions.html#ValueError
IndexError	https://docs.python.org/library/exceptions.html#IndexError
¶	https://docs.python.org/library/exceptions.html#ZeroDivisionError
OSError	https://docs.python.org/library/exceptions.html#OSError
¶	https://docs.python.org/library/exceptions.html#EnvironmentError
¶	https://docs.python.org/library/exceptions.html#IOError
¶	https://docs.python.org/library/exceptions.html#WindowsError
¶	https://docs.python.org/library/exceptions.html#os-exceptions
OSError	https://docs.python.org/library/exceptions.html#OSError
¶	https://docs.python.org/library/exceptions.html#BlockingIOError
EAGAIN	https://docs.python.org/library/errno.html#errno.EAGAIN
EALREADY	https://docs.python.org/library/errno.html#errno.EALREADY
EWOULDBLOCK	https://docs.python.org/library/errno.html#errno.EWOULDBLOCK
EINPROGRESS	https://docs.python.org/library/errno.html#errno.EINPROGRESS
OSError	https://docs.python.org/library/exceptions.html#OSError
BlockingIOError	https://docs.python.org/library/exceptions.html#BlockingIOError
¶	https://docs.python.org/library/exceptions.html#BlockingIOError.characters_written
io	https://docs.python.org/library/io.html#module-io
¶	https://docs.python.org/library/exceptions.html#ChildProcessError
ECHILD	https://docs.python.org/library/errno.html#errno.ECHILD
¶	https://docs.python.org/library/exceptions.html#ConnectionError
BrokenPipeError	https://docs.python.org/library/exceptions.html#BrokenPipeError
ConnectionAbortedError	https://docs.python.org/library/exceptions.html#ConnectionAbortedError
ConnectionRefusedError	https://docs.python.org/library/exceptions.html#ConnectionRefusedError
ConnectionResetError	https://docs.python.org/library/exceptions.html#ConnectionResetError
¶	https://docs.python.org/library/exceptions.html#BrokenPipeError
ConnectionError	https://docs.python.org/library/exceptions.html#ConnectionError
EPIPE	https://docs.python.org/library/errno.html#errno.EPIPE
ESHUTDOWN	https://docs.python.org/library/errno.html#errno.ESHUTDOWN
¶	https://docs.python.org/library/exceptions.html#ConnectionAbortedError
ConnectionError	https://docs.python.org/library/exceptions.html#ConnectionError
ECONNABORTED	https://docs.python.org/library/errno.html#errno.ECONNABORTED
¶	https://docs.python.org/library/exceptions.html#ConnectionRefusedError
ConnectionError	https://docs.python.org/library/exceptions.html#ConnectionError
ECONNREFUSED	https://docs.python.org/library/errno.html#errno.ECONNREFUSED
¶	https://docs.python.org/library/exceptions.html#ConnectionResetError
ConnectionError	https://docs.python.org/library/exceptions.html#ConnectionError
ECONNRESET	https://docs.python.org/library/errno.html#errno.ECONNRESET
¶	https://docs.python.org/library/exceptions.html#FileExistsError
EEXIST	https://docs.python.org/library/errno.html#errno.EEXIST
¶	https://docs.python.org/library/exceptions.html#FileNotFoundError
ENOENT	https://docs.python.org/library/errno.html#errno.ENOENT
¶	https://docs.python.org/library/exceptions.html#InterruptedError
EINTR	https://docs.python.org/library/errno.html#errno.EINTR
PEP 475	https://peps.python.org/pep-0475/
InterruptedError	https://docs.python.org/library/exceptions.html#InterruptedError
¶	https://docs.python.org/library/exceptions.html#IsADirectoryError
os.remove()	https://docs.python.org/library/os.html#os.remove
EISDIR	https://docs.python.org/library/errno.html#errno.EISDIR
¶	https://docs.python.org/library/exceptions.html#NotADirectoryError
os.listdir()	https://docs.python.org/library/os.html#os.listdir
ENOTDIR	https://docs.python.org/library/errno.html#errno.ENOTDIR
¶	https://docs.python.org/library/exceptions.html#PermissionError
EACCES	https://docs.python.org/library/errno.html#errno.EACCES
EPERM	https://docs.python.org/library/errno.html#errno.EPERM
ENOTCAPABLE	https://docs.python.org/library/errno.html#errno.ENOTCAPABLE
ENOTCAPABLE	https://docs.python.org/library/errno.html#errno.ENOTCAPABLE
PermissionError	https://docs.python.org/library/exceptions.html#PermissionError
¶	https://docs.python.org/library/exceptions.html#ProcessLookupError
ESRCH	https://docs.python.org/library/errno.html#errno.ESRCH
¶	https://docs.python.org/library/exceptions.html#TimeoutError
ETIMEDOUT	https://docs.python.org/library/errno.html#errno.ETIMEDOUT
OSError	https://docs.python.org/library/exceptions.html#OSError
PEP 3151	https://peps.python.org/pep-3151/
¶	https://docs.python.org/library/exceptions.html#warnings
Warning Categories	https://docs.python.org/library/warnings.html#warning-categories
¶	https://docs.python.org/library/exceptions.html#Warning
¶	https://docs.python.org/library/exceptions.html#UserWarning
¶	https://docs.python.org/library/exceptions.html#DeprecationWarning
PEP 565	https://peps.python.org/pep-0565/
Python Development Mode	https://docs.python.org/library/devmode.html#devmode
PEP 387	https://peps.python.org/pep-0387/
¶	https://docs.python.org/library/exceptions.html#PendingDeprecationWarning
DeprecationWarning	https://docs.python.org/library/exceptions.html#DeprecationWarning
Python Development Mode	https://docs.python.org/library/devmode.html#devmode
PEP 387	https://peps.python.org/pep-0387/
¶	https://docs.python.org/library/exceptions.html#SyntaxWarning
¶	https://docs.python.org/library/exceptions.html#RuntimeWarning
¶	https://docs.python.org/library/exceptions.html#FutureWarning
¶	https://docs.python.org/library/exceptions.html#ImportWarning
Python Development Mode	https://docs.python.org/library/devmode.html#devmode
¶	https://docs.python.org/library/exceptions.html#UnicodeWarning
¶	https://docs.python.org/library/exceptions.html#EncodingWarning
Opt-in EncodingWarning	https://docs.python.org/library/io.html#io-encoding-warning
¶	https://docs.python.org/library/exceptions.html#BytesWarning
bytes	https://docs.python.org/library/stdtypes.html#bytes
bytearray	https://docs.python.org/library/stdtypes.html#bytearray
¶	https://docs.python.org/library/exceptions.html#ResourceWarning
Python Development Mode	https://docs.python.org/library/devmode.html#devmode
¶	https://docs.python.org/library/exceptions.html#exception-groups
except	https://docs.python.org/reference/compound_stmts.html#except
except*	https://docs.python.org/reference/compound_stmts.html#except-star
¶	https://docs.python.org/library/exceptions.html#ExceptionGroup
¶	https://docs.python.org/library/exceptions.html#BaseExceptionGroup
BaseExceptionGroup	https://docs.python.org/library/exceptions.html#BaseExceptionGroup
BaseException	https://docs.python.org/library/exceptions.html#BaseException
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