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Python Built-in Exceptions

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Built-in Exceptions

The table below shows built-in exceptions that are usually raised in Python:

Exception Description
ArithmeticError Raised when an error occurs in numeric calculations
AssertionError Raised when an assert statement fails
AttributeError Raised when attribute reference or assignment fails
Exception Base class for most built-in exceptions
EOFError Raised when the input() method hits an "end of file" condition (EOF)
FloatingPointError Raised when a floating point calculation fails
GeneratorExit Raised when a generator is closed (with the close() method)
ImportError Raised when an imported module does not exist
IndentationError Raised when indentation is not correct
IndexError Raised when an index of a sequence does not exist
KeyError Raised when a key does not exist in a dictionary
KeyboardInterrupt Raised when the user stops the program, usually by pressing Ctrl+C
LookupError Base class for the errors raised when a key or an index is not found
MemoryError Raised when a program runs out of memory
NameError Raised when a variable does not exist
NotImplementedError Raised when an abstract method requires an inherited class to override the method
OSError Raised when a system related operation causes an error
OverflowError Raised when the result of a numeric calculation is too large
ReferenceError Raised when a weak reference object does not exist
RuntimeError Raised when an error occurs that does not belong to any specific exceptions
StopIteration Raised when the next() method of an iterator has no further values
SyntaxError Raised when a syntax error occurs
TabError Raised when the indentation mixes tabs and spaces in a way that is not consistent
SystemError Raised when a system error occurs
SystemExit Raised when the sys.exit() function is called
TypeError Raised when two different types are combined
UnboundLocalError Raised when a local variable is referenced before assignment
UnicodeError Raised when a unicode problem occurs
UnicodeEncodeError Raised when a unicode encoding problem occurs
UnicodeDecodeError Raised when a unicode decoding problem occurs
UnicodeTranslateError Raised when a unicode translation problem occurs
ValueError Raised when there is a wrong value in a specified data type
ZeroDivisionError Raised when the second operator in a division is zero
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