PyCharm Unit test fails

Please try to reinstall PyCharm from scratch. Looks like "helpers" folder is semi-updated for some reason. Please let me know if the problem remains.

I've got the same problem.  I deleted pycharm from applications, reinstalled and no luck

Same issue here on a fresh install of PyCharm

I have the same error for PyCharm 2017.3.3, using Python 2_6_6_64, I think a non-backwards compatible argument "buffer" was added to the helpers at some point, breaking old Python versions. PyCharm claims to support 2.4 and later, some Linux distros, like the one at my Web hotel, still use 2.6.

Testing started at 11:08 ...
C:\programmering\Python\2_6_6_64\python.exe "C:\Program Files\JetBrains\PyCharm Community Edition 2017.3.3\helpers\pycharm\_jb_unittest_runner.py" --path C:/programmering/Jumpgate/cgi-bin/BestHaul.py
Traceback (most recent call last):
File "C:\Program Files\JetBrains\PyCharm Community Edition 2017.3.3\helpers\pycharm\_jb_unittest_runner.py", line 35, in <module>
main(argv=args, module=None, testRunner=unittestpy.TeamcityTestRunner, buffer=not JB_DISABLE_BUFFERING)
TypeError: __init__() got an unexpected keyword argument 'buffer'
Launching unittests with arguments python -m unittest discover -s C:/programmering/Jumpgate/cgi-bin -p BestHaul.py -t C:\programmering\Jumpgate\cgi-bin in C:\programmering\Jumpgate\cgi-bin

From the Python 2.7 unittest.main docs:

Changed in version 2.7: The exit, verbosity, failfast, catchbreak and buffer parameters were added.

So PyCharm unittest support is now only compatible with 2.7 and forward it seems.

This is broken from 2017.3.1, revertting to 2016.3.2 made unittest.main work again.

> Please try to reinstall PyCharm from scratch. Looks like "helpers" folder is semi-updated for some reason. Please let me know if the problem remains.Please try to reinstall PyCharm from scratch. Looks like "helpers" folder is semi-updated for some reason. Please let me know if the problem remains.

Mmmm.. maybe he should update his BIOS too, and try installing Windows 8? If you read the error message carefully, and then the code for Python 2.6.6 unittest.main, comparing with the documentation for 2.7, this doesn't really seem to be a semi-update of the local folder, but a semi-update of the source code.

I use the Community Edition, so I can't complain really, I use it for free, but at least there is a workaround if you still have your 2016.3.2 installer saved. Not sure how to find that on the PyCharm site though.

And by the way, thanks for an overall very nice, free for some, Python environment!

And I wouldn't mind if you said PyCharm 2018 will only support Python 2.7, leaving older versions with 2016.3.2, but then I wouldn't want these auto update messages.

Thank you for the feedback. Please follow PY-26042, I reproduced the problem and reopened the ticket. I am sorry it took so long.