如何从python代码引发Suds.WebFault？

__init__

__init__(self, fault, document)

import suds

try:
    client.service.Method(parameter)
except suds.WebFault, e:
    print e

suds.__init__.py

class WebFault(Exception):
    def __init__(self, fault, document):
        if hasattr(fault, \'faultstring\'):
            Exception.__init__(self, u\"Server raised fault: \'%s\'\" %
                fault.faultstring)
        self.fault = fault
        self.document = document

import suds

class Fault(object): 
    faultstring = \'my error message\'

raise suds.WebFault(Fault(), document=None)

<Fault>