Python common error semantics: common exceptions Exception and common errors Error and common warnings

The semantics of common problems (Exception, Error, Warning) in Python

Common exception semantics (Exception)

Exception

• Exception base class for general errors

• BaseException The base class of all exceptions

• SystemExit interpreter requests to exit

• KeyboardInterrupt user interrupt execution (usually input ^C)

• StopIteration iterator has no more values

• GeneratorExit generator (generator) has an exception to notify the exit

Common error semantics (Error)

Error type

• TypeError invalid operation on type

• SystemError General interpreter system error

• TabError Tab and spaces mixed

• StandardError The base class for all built-in standard exceptions

• ArithmeticError The base class for all numerical calculation errors

• FloatingPointError floating point calculation error

• OverflowError Numerical operation exceeds the maximum limit

• ZeroDivisionError divide (or modulo) zero (all data types)

• AssertionError Assertion statement failed

• AttributeError object does not have this attribute

• EOFError has no built-in input and reaches the EOF mark

• EnvironmentError base class for operating system errors

• IOError Input/output operation failed

• OSError operating system error

• WindowsError system call failed

• ImportError Import module/object failed

• LookupError base class for invalid data query

• IndexError does not have this index in the sequence

• There is no such key in the KeyError map

• MemoryError memory overflow error (not fatal to the Python interpreter)

• NameError object not declared/initialized (no attributes)

• UnboundLocalError access to uninitialized local variables

• ReferenceError Weak reference attempts to access objects that have been garbage collected

• RuntimeError General runtime error

• NotImplementedError Method not yet implemented SyntaxError Python syntax error

• IndentationError Indentation error

• ValueError passed an invalid parameter

• UnicodeError Unicode related errors

• UnicodeDecodeError Unicode decoding error

• UnicodeEncodeError Unicode encoding error

• UnicodeTranslateError Unicode conversion error

Common warning semantics (Warning)

Warning type

• RuntimeWarning runtime behavior warning

• SyntaxWarning Suspicious syntax warning

• UserWarning User code generated warning

• DeprecationWarning Warning about deprecated features

• FutureWarning A warning that the semantics of the structure will change in the future

• OverflowWarning warning about automatic promotion to long integer

• PendingDeprecationWarning A warning that the feature will be deprecated