def test_invalidLetters(self):
        self.assertFalse(isIPAddress('a.2.3.4'))
        self.assertFalse(isIPAddress('1.b.3.4'))
L{isIPAddress} should return C{False} for any non-decimal dotted
dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/test/test_abstract.py/AddressTests.test_invalidLetters