In trying to cx_Freeze a pyzmq-dependent Python 3.4 application on Windows 7, I am getting an exception when running the executable I can't make much sense of. The error, traceback edited for brevity, looks like this:
Traceback (most recent call last):
File "C:\Python34\lib\site-packages\cx_freeze-4.3.3-py3.4-win32.egg\cx_Freeze\initscripts\Console.py", line 27, in <module>
exec(code, m.__dict__)
[...]
File "Q:\Users\arvek\Repositories\accc-gui\aiozmq\aiozmq\__init__.py", line 4, in <module>
import zmq
File "C:\Python34\lib\importlib\_bootstrap.py", line 2237, in _find_and_load
return _find_and_load_unlocked(name, import_)
File "C:\Python34\lib\importlib\_bootstrap.py", line 2226, in _find_and_load_unlocked
module = _SpecMethods(spec)._load_unlocked()
File "C:\Python34\lib\importlib\_bootstrap.py", line 1191, in _load_unlocked
return self._load_backward_compatible()
File "C:\Python34\lib\importlib\_bootstrap.py", line 1161, in _load_backward_compatible
spec.loader.load_module(spec.name)
File "C:\Python34\lib\site-packages\zmq\__init__.py", line 49, in <module>
from zmq.backend import *
File "C:\Python34\lib\importlib\_bootstrap.py", line 2237, in _find_and_load
return _find_and_load_unlocked(name, import_)
File "C:\Python34\lib\importlib\_bootstrap.py", line 2226, in _find_and_load_unlocked
module = _SpecMethods(spec)._load_unlocked()
File "C:\Python34\lib\importlib\_bootstrap.py", line 1191, in _load_unlocked
return self._load_backward_compatible()
File "C:\Python34\lib\importlib\_bootstrap.py", line 1161, in _load_backward_compatible
spec.loader.load_module(spec.name)
File "C:\Python34\lib\site-packages\zmq\backend\__init__.py", line 41, in <module>
reraise(*exc_info)
File "C:\Python34\lib\site-packages\zmq\utils\sixcerpt.py", line 34, in reraise
raise value
File "C:\Python34\lib\site-packages\zmq\backend\__init__.py", line 29, in <module>
_ns = select_backend(first)
File "C:\Python34\lib\site-packages\zmq\backend\select.py", line 26, in select_backend
mod = __import__(name, fromlist=public_api)
File "C:\Python34\lib\importlib\_bootstrap.py", line 2237, in _find_and_load
return _find_and_load_unlocked(name, import_)
File "C:\Python34\lib\importlib\_bootstrap.py", line 2226, in _find_and_load_unlocked
module = _SpecMethods(spec)._load_unlocked()
File "C:\Python34\lib\importlib\_bootstrap.py", line 1191, in _load_unlocked
return self._load_backward_compatible()
File "C:\Python34\lib\importlib\_bootstrap.py", line 1161, in _load_backward_compatible
spec.loader.load_module(spec.name)
File "C:\Python34\lib\site-packages\zmq\backend\cython\__init__.py", line 6, in <module>
from . import (constants, error, message, context,
File "C:\Python34\lib\importlib\_bootstrap.py", line 2284, in _handle_fromlist
_call_with_frames_removed(import_, from_name)
File "C:\Python34\lib\importlib\_bootstrap.py", line 321, in _call_with_frames_removed
return f(*args, **kwds)
File "C:\Python34\lib\importlib\_bootstrap.py", line 2237, in _find_and_load
return _find_and_load_unlocked(name, import_)
File "C:\Python34\lib\importlib\_bootstrap.py", line 2226, in _find_and_load_unlocked
module = _SpecMethods(spec)._load_unlocked()
File "C:\Python34\lib\importlib\_bootstrap.py", line 1191, in _load_unlocked
return self._load_backward_compatible()
File "C:\Python34\lib\importlib\_bootstrap.py", line 1161, in _load_backward_compatible
spec.loader.load_module(spec.name)
File "ExtensionLoader_zmq_backend_cython_error.py", line 22, in <module>
File "ExtensionLoader_zmq_backend_cython_error.py", line 14, in __bootstrap__
ImportError: DLL load failed: The specified module could not be found.
What's the specific cause of this error, i.e. which module (DLL I presume) is missing?
The hint lies in the following traceback entry:
File "C:\Python34\lib\site-packages\zmq\backend\cython\__init__.py", line 6, in <module>
from . import (constants, error, message, context,
It doesn't give a direct answer to what's wrong, but does point towards the modules zmq.backend.cython.constants etc. being the problem, i.e. they are missing a DLL dependency. After checking with DependencyWalker, it turns out that 'C:\Python34\lib\site-packages\zmq\libzmq.pyd' is the DLL dependency in question. If that file is included with the frozen application, it works.