def _set_signature()

in later/unittest/backport/mock.py [0:0]

• 19 lines of code
• 3 McCabe index (conditional complexity)

def _set_signature(mock, original, instance=False):
    # creates a function with signature (*args, **kwargs) that delegates to a
    # mock. It still does signature checking by calling a lambda with the same
    # signature as the original.

    skipfirst = isinstance(original, type)
    result = _get_signature_object(original, instance, skipfirst)
    if result is None:
        return mock
    func, sig = result
    def checksig(*args, **kwargs):
        sig.bind(*args, **kwargs)
    _copy_func_details(func, checksig)

    name = original.__name__
    if not name.isidentifier():
        name = 'funcopy'
    context = {'_checksig_': checksig, 'mock': mock}
    src = """def %s(*args, **kwargs):
    _checksig_(*args, **kwargs)
    return mock(*args, **kwargs)""" % name
    exec (src, context)
    funcopy = context[name]
    _setup_func(funcopy, mock, sig)
    return funcopy