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10.4 Raising Exceptions

The raise statement allows the programmer to force a specified exception to occur. For example:

    >>> raise NameError, 'HiThere'
    Traceback (most recent call last):
      File "<stdin>", line 1, in ?
    NameError: HiThere

The first argument to raise names the exception to be raised. The optional second argument specifies the exception's argument.

If you need to determine whether an exception was raised but don't intend to handle it, a simpler form of the raise statement allows you to re-raise the exception:

    >>> try:
    ...     raise NameError, 'HiThere'
    ... except NameError:
    ...     print 'An exception flew by!'
    ...     raise
    An exception flew by!
    Traceback (most recent call last):
      File "<stdin>", line 2, in ?
    NameError: HiThere

  Published under the terms of the Python License Design by Interspire