gpg module raises "Empty module name" error

[Jelmer Vernooij]

error: breezy.tests.blackbox.test_log.TestLogSignatures.test_log_with_signatures [ multipart
Content-Type: text/plain;charset=utf8
log
0^M
Content-Type: text/x-traceback;charset=utf8,language=python
traceback
471^M
Traceback (most recent call last):
  File "/tmp/tarmac/branch.IhAC3z/breezy/tests/blackbox/test_log.py", line 480, in test_log_with_signatures
    self.requireFeature(features.gpg)
  File "/tmp/tarmac/branch.IhAC3z/breezy/tests/__init__.py", line 1914, in requireFeature
    if not feature.available():
  File "/tmp/tarmac/branch.IhAC3z/breezy/tests/features.py", line 46, in available
    self._available = self._probe()
  File "/tmp/tarmac/branch.IhAC3z/breezy/tests/features.py", line 175, in _probe
    self._module = __import__(self.module_name, {}, {}, [''])
  File "/usr/lib/python2.7/dist-packages/gpg/__init__.py", line 101, in <module>
    from . import core
  File "/usr/lib/python2.7/dist-packages/gpg/core.py", line 34, in <module>
    from . import gpgme
  File "/usr/lib/python2.7/dist-packages/gpg/gpgme.py", line 21, in <module>
    _gpgme = swig_import_helper()
  File "/usr/lib/python2.7/dist-packages/gpg/gpgme.py", line 18, in swig_import_helper
    return importlib.import_module(mname)
  File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
ValueError: Empty module name
0^M
]

[Jelmer Vernooij (jelmer)]

I can reproduce this outside of bzr as well:

morgaine:~/src/breezy/trunk% python
Python 2.7.13+ (default, Jul 19 2017, 18:15:03)
[GCC 6.4.0 20170704] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> __import__('gpg', {}, {}, [''])