def test_str_lstrip(self):
"""Check matches the python string lstrip method."""
self._test_method("lstrip")
s = Seq(" ACGT ")
m = MutableSeq(" ACGT ")
self.assertEqual(s.lstrip(), "ACGT ")
self.assertRaises(TypeError, s.lstrip, 7)
self.assertEqual(s, " ACGT ")
self.assertEqual(m.lstrip(), "ACGT ")
self.assertRaises(TypeError, m.lstrip, 7)
self.assertEqual(m, " ACGT ")
self.assertEqual(m.lstrip(inplace=True), "ACGT ")
self.assertEqual(m, "ACGT ")