class - Print the Python Exception/Error Hierarchy

Question

Is the any command line option in python to print the Exception/Error Class hierarchy?

The output should be similar to http://docs.python.org/2/library/exceptions.html#exception-hierarchy

Answer 1

inspect module might help, specifically getclasstree() function:

Arrange the given list of classes into a hierarchy of nested lists. Where a nested list appears, it contains classes derived from the class whose entry immediately precedes the list.

inspect.getclasstree(inspect.getmro(Exception))

Or, you can recursively go through __subclasses__() down by an inheritance tree, like this:

def classtree(cls, indent=0):
    print '.' * indent, cls.__name__
    for subcls in cls.__subclasses__():
        classtree(subcls, indent + 3)

classtree(BaseException)

prints:

 BaseException
... Exception
...... StandardError
......... TypeError
......... ImportError
............ ZipImportError
......... EnvironmentError
............ IOError
............... ItimerError
............ OSError
......... EOFError
......... RuntimeError
............ NotImplementedError
......... NameError
............ UnboundLocalError
......... AttributeError
......... SyntaxError
............ IndentationError
............... TabError
......... LookupError
............ IndexError
............ KeyError
............ CodecRegistryError
......... ValueError
............ UnicodeError
............... UnicodeEncodeError
............... UnicodeDecodeError
............... UnicodeTranslateError
......... AssertionError
......... ArithmeticError
............ FloatingPointError
............ OverflowError
............ ZeroDivisionError
......... SystemError
............ CodecRegistryError
......... ReferenceError
......... MemoryError
......... BufferError
...... StopIteration
...... Warning
......... UserWarning
......... DeprecationWarning
......... PendingDeprecationWarning
......... SyntaxWarning
......... RuntimeWarning
......... FutureWarning
......... ImportWarning
......... UnicodeWarning
......... BytesWarning
...... _OptionError
... GeneratorExit
... SystemExit
... KeyboardInterrupt