Traceback (most recent call last):

 "/tmp/buildd/pandas-0.15.0/debian/tmp/usr/lib/python2.7/dist-packages/pandas/io/tests/test_parsers.py", line 3204, in test_precise_conversion
self.assertTrue(sum(precise_errors) <= sum(normal_errors))AssertionError: False is not true
>>> Traceback (most recent call last):

 "<console>", line 1, in <module>

 "<string>", line 12, in <module>

 "/Users/miles/.../marshmallow/serializer.py", line 193, in __init__
self._update_fields(obj)

 "/Users/miles/.../marshmallow/serializer.py", line 294, in _update_fields
ret = self.__filter_fields(self.only)

 "/Users/miles/.../marshmallow/serializer.py", line 362, in __filter_fields
'"{0}" is not a valid field for {1}.'.format(key, self.obj))AttributeError: "m" is not a valid field for {'email': 'blah'}.