Fix some style guide issues: keyword arguments are supposed to always be
supplied using the keyword argument name=value.
http://code.google.com/p/soc/wiki/PythonStyleGuide#Default_Argument_Values
"""Error types for dispatcher mechanism
"""
class DispatcherError(Exception):
"""Base class for all Dispatcher errors"""
class DispatcherKeyError(KeyError, DispatcherError):
"""Error raised when unknown (sender,signal) set specified"""
class DispatcherTypeError(TypeError, DispatcherError):
"""Error raised when inappropriate signal-type specified (None)"""