#Error exception must derive from BaseException even when it does (Python 2.7)

[techhelpnotes]

Error exception must derive from BaseException even when it does (Python 2.7)

__new__ is a staticmethod that needs to return an instance.

Instead, use the __init__ method:

class TestFailed(Exception):    def __init__(self, m):        self.message = m    def __str__(self):        return self.message try:    raise TestFailed(Oops) except TestFailed as x:    print x

Others have shown you how to fix your implementation, but I feel it important to point out that the behavior you are implementing is already the standard behavior of exceptions in Python so most of your code is completely unnecessary. Just derive from Exception (the appropriate base class for runtime exceptions) and put pass as the body.

[techhelpnotes]

Error exception must derive from BaseException even when it does (Python 2.7)

__new__ is a staticmethod that needs to return an instance.

Instead, use the __init__ method:

class TestFailed(Exception):    def __init__(self, m):        self.message = m    def __str__(self):        return self.message

[techhelpnotes]

Error exception must derive from BaseException even when it does (Python 2.7)

__new__ is a staticmethod that needs to return an instance.

Instead, use the __init__ method:

class TestFailed(Exception):    def __init__(self, m):        self.message = m    def __str__(self):        return self.message try:    raise TestFailed(Oops) except TestFailed as x:    print x

Others have shown you how to fix your implementation, but I feel it important to point out that the behavior you are implementing is already the standard behavior of exceptions in Python so most of your code is completely unnecessary. Just derive from Exception (the appropriate base class for runtime exceptions) and put pass as the body.