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dispatcher.addHandler(): validate value of group is int
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@ -220,6 +220,8 @@ class Dispatcher(object):
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if not isinstance(handler, Handler):
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raise TypeError(
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'handler is not an instance of {0}'.format(Handler.__name__))
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if not isinstance(group, int):
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raise TypeError('group is not int')
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if group not in self.handlers:
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self.handlers[group] = list()
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