pytest cannot import module while python can
I am working on a package in Python. I use virtualenv. I set the path to the root of the module in a .pth path in my virtualenv, so that I can import modules of the package while developing the code and do testing (Question 1: is it a good way to do?). This works fine (here is an example, this is the behavior I want):
(VEnvTestRc) zz@zz:~/Desktop/GitFolders/rc$ python Python 2.7.12 (default, Jul 1 2016, 15:12:24) [GCC 5.4.0 20160609] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> from rc import ns >>> exit() (VEnvTestRc) zz@zz:~/Desktop/GitFolders/rc$ python tests/test_ns.py issued command: echo hello command output: hello
However, if I try to use PyTest, I get some import error messages:
(VEnvTestRc) zz@zz:~/Desktop/GitFolders/rc$ pytest =========================================== test session starts ============================================ platform linux2 -- Python 2.7.12, pytest-3.0.5, py-1.4.31, pluggy-0.4.0 rootdir: /home/zz/Desktop/GitFolders/rc, inifile: collected 0 items / 1 errors ================================================== ERRORS ================================================== ________________________________ ERROR collecting tests/test_ns.py ________________________________ ImportError while importing test module '/home/zz/Desktop/GitFolders/rc/tests/test_ns.py'. Hint: make sure your test modules/packages have valid Python names. Traceback: tests/test_ns.py:2: in <module> from rc import ns E ImportError: cannot import name ns !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Interrupted: 1 errors during collection !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! ========================================= 1 error in 0.09 seconds ========================================== (VEnvTestRc) zz@zz:~/Desktop/GitFolders/rc$ which pytest /home/zz/Desktop/VirtualEnvs/VEnvTestRc/bin/pytest
I am a bit puzzled, it looks like this indicates an import error, but Python does it fine so why is there a problem specifically with PyTest? Any suggestion to the reason / remedy (Question 2)? I googled and stack-overflowed the 'ImportError: cannot import' error for PyTest, but the hits I got were related to missing python path and remedy to this, which does not seem to be the problem here. Any suggestions?
Found the answer:
DO NOT put a
__init__.py file in a folder containing TESTS if you plan on using pytest. I had one such file, deleting it solved the problem.
This was actually buried in the comments to the second answer of PATH issue with pytest 'ImportError: No module named YadaYadaYada' so I did not see it, hope it gets more visibility here.