pytest fails in Windows in Python 3.5, but not 2.7

[BookOwl]

When I run py -3 -m pytest --version in Python 3.5 on Windows 8.1, I get this error:

Traceback (most recent call last):
  File "C:\Users\Matthew\AppData\Local\Programs\Python\Python35-32\lib\runpy.py", line 170, in _run_module_as_main
    "__main__", mod_spec)
  File "C:\Users\Matthew\AppData\Local\Programs\Python\Python35-32\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "C:\Users\Matthew\AppData\Local\Programs\Python\Python35-32\lib\site-packages\pytest.py", line 17, in <module>
    raise SystemExit(pytest.main())
  File "C:\Users\Matthew\AppData\Local\Programs\Python\Python35-32\lib\site-packages\_pytest\config.py", line 39, in main
    config = _prepareconfig(args, plugins)
  File "C:\Users\Matthew\AppData\Local\Programs\Python\Python35-32\lib\site-packages\_pytest\config.py", line 118, in _prepareconfig
    pluginmanager=pluginmanager, args=args)
  File "C:\Users\Matthew\AppData\Local\Programs\Python\Python35-32\lib\site-packages\_pytest\vendored_packages\pluggy.py", line 724, in __call__
    return self._hookexec(self, self._nonwrappers + self._wrappers, kwargs)
  File "C:\Users\Matthew\AppData\Local\Programs\Python\Python35-32\lib\site-packages\_pytest\vendored_packages\pluggy.py", line 338, in _hookexec
    return self._inner_hookexec(hook, methods, kwargs)
  File "C:\Users\Matthew\AppData\Local\Programs\Python\Python35-32\lib\site-packages\_pytest\vendored_packages\pluggy.py", line 333, in <lambda>
    _MultiCall(methods, kwargs, hook.spec_opts).execute()
  File "C:\Users\Matthew\AppData\Local\Programs\Python\Python35-32\lib\site-packages\_pytest\vendored_packages\pluggy.py", line 595, in execute
    return _wrapped_call(hook_impl.function(*args), self.execute)
  File "C:\Users\Matthew\AppData\Local\Programs\Python\Python35-32\lib\site-packages\_pytest\vendored_packages\pluggy.py", line 249, in _wrapped_call
    wrap_controller.send(call_outcome)
  File "C:\Users\Matthew\AppData\Local\Programs\Python\Python35-32\lib\site-packages\_pytest\helpconfig.py", line 28, in pytest_cmdline_parse
    config = outcome.get_result()
  File "C:\Users\Matthew\AppData\Local\Programs\Python\Python35-32\lib\site-packages\_pytest\vendored_packages\pluggy.py", line 278, in get_result
    raise ex[1].with_traceback(ex[2])
  File "C:\Users\Matthew\AppData\Local\Programs\Python\Python35-32\lib\site-packages\_pytest\vendored_packages\pluggy.py", line 264, in __init__
    self.result = func()
  File "C:\Users\Matthew\AppData\Local\Programs\Python\Python35-32\lib\site-packages\_pytest\vendored_packages\pluggy.py", line 596, in execute
    res = hook_impl.function(*args)
  File "C:\Users\Matthew\AppData\Local\Programs\Python\Python35-32\lib\site-packages\_pytest\config.py", line 856, in pytest_cmdline_parse
    self.parse(args)
  File "C:\Users\Matthew\AppData\Local\Programs\Python\Python35-32\lib\site-packages\_pytest\config.py", line 961, in parse
    self._preparse(args, addopts=addopts)
  File "C:\Users\Matthew\AppData\Local\Programs\Python\Python35-32\lib\site-packages\_pytest\config.py", line 932, in _preparse
    args=args, parser=self._parser)
  File "C:\Users\Matthew\AppData\Local\Programs\Python\Python35-32\lib\site-packages\_pytest\vendored_packages\pluggy.py", line 724, in __call__
    return self._hookexec(self, self._nonwrappers + self._wrappers, kwargs)
  File "C:\Users\Matthew\AppData\Local\Programs\Python\Python35-32\lib\site-packages\_pytest\vendored_packages\pluggy.py", line 338, in _hookexec
    return self._inner_hookexec(hook, methods, kwargs)
  File "C:\Users\Matthew\AppData\Local\Programs\Python\Python35-32\lib\site-packages\_pytest\vendored_packages\pluggy.py", line 333, in <lambda>
    _MultiCall(methods, kwargs, hook.spec_opts).execute()
  File "C:\Users\Matthew\AppData\Local\Programs\Python\Python35-32\lib\site-packages\_pytest\vendored_packages\pluggy.py", line 595, in execute
    return _wrapped_call(hook_impl.function(*args), self.execute)
  File "C:\Users\Matthew\AppData\Local\Programs\Python\Python35-32\lib\site-packages\_pytest\vendored_packages\pluggy.py", line 244, in _wrapped_call
    next(wrap_controller)   # first yield
  File "C:\Users\Matthew\AppData\Local\Programs\Python\Python35-32\lib\site-packages\_pytest\capture.py", line 34, in pytest_load_initial_conftests
    _readline_workaround()
  File "C:\Users\Matthew\AppData\Local\Programs\Python\Python35-32\lib\site-packages\_pytest\capture.py", line 470, in _readline_workaround
    import readline  # noqa
  File "C:\Users\Matthew\AppData\Local\Programs\Python\Python35-32\lib\site-packages\readline.py", line 6, in <module>
    from pyreadline.rlmain import Readline
  File "C:\Users\Matthew\AppData\Local\Programs\Python\Python35-32\lib\site-packages\pyreadline\__init__.py", line 11, in <module>
    from . import unicode_helper, logger, clipboard, lineeditor, modes, console
  File "C:\Users\Matthew\AppData\Local\Programs\Python\Python35-32\lib\site-packages\pyreadline\console\__init__.py", line 15, in <module>
    from .console import *
  File "C:\Users\Matthew\AppData\Local\Programs\Python\Python35-32\lib\site-packages\pyreadline\console\console.py", line 610, in <module>
    msvcrt = cdll.LoadLibrary(ctypes.util.find_msvcrt())
  File "C:\Users\Matthew\AppData\Local\Programs\Python\Python35-32\lib\ctypes\__init__.py", line 425, in LoadLibrary
    return self._dlltype(name)
  File "C:\Users\Matthew\AppData\Local\Programs\Python\Python35-32\lib\ctypes\__init__.py", line 347, in __init__
    self._handle = _dlopen(self._name, mode)
TypeError: bad argument type for built-in operation

It used to work in python 3.5 and still does in 2.7, so I don't know what's wrong.

pip list output:

appdirs (1.4.0)
args (0.1.0)
asciimatics (1.6.0)
astor (0.5)
beautifulsoup4 (4.4.0)
clint (0.5.1)
colorama (0.3.7)
CommonMark (0.6.3)
construct (2.0.6)
cycler (0.9.0)
distribute (0.7.3)
et-xmlfile (1.0.1)
fpdf (1.7.2)
future (0.15.2)
google-speech (1.0.14)
grako (3.6.5)
gTTS-token (1.0.1)
html5lib (0.9999999)
httplib2 (0.9.2)
hy (0.11.1)
IMAPClient (0.13)
jdcal (1.2)
kurt (2.0.7)
matplotlib (1.5.1)
mp3play (0.1.15)
numpy (1.10.4)
nustack (0.11.0)
openpyxl (2.3.0)
pdfkit (0.5.0)
Pillow (3.1.1)
pip (8.0.3)
pkginfo (1.2.1)
playsound (1.1.0)
py (1.4.31)
py2exe (0.9.2.2)
PyAudio (0.2.9)
PyAutoGUI (0.9.31)
pyfiglet (0.7.4)
pyglet (1.2.4)
Pygments (2.1.3)
pyhistogram (0.1)
PyMsgBox (1.0.3)
PyOpenGL (3.1.0)
pyparsing (2.0.7)
PyPDF2 (1.25.1)
pypiwin32 (219)
pyreadline (2.0)
pyreq (1.1.0)
PyScreeze (0.1.8)
PySocks (1.5.6)
pytest (2.9.0)
python-2048a (0.0.0)
python-dateutil (2.4.2)
PyTweening (1.0.3)
pytz (2015.7)
pyzmail (1.0.3)
requests (2.9.1)
requests-toolbelt (0.6.0)
rply (0.7.4)
scratchapi (1.0.0)
selenium (2.48.0)
Send2Trash (1.3.0)
setuptools (18.2)
six (1.10.0)
sympy (0.7.6.1)
tk2048 (1.4)
twilio (4.9.0)
twine (1.6.5)
tymeventure (0.1.0)
virtualenv (14.0.6)
wheel (0.29.0)
witkets (0.2.4)

[BookOwl]

I can confirm that pytest works in Python 3.2

[nicoddemus]

Hi @BookOwl, sorry for taking so long to respond.

Hmm it seems there's something wrong with your installation. I assume executing:

python -c "import readline"

Also raises a TypeError?

[BookOwl]

@nicoddemus, yes, it does.

[codewarrior0]

I cannot reproduce this with Windows, Python 3.5, and py.test 2.9.0. However, my version of pyreadline is 2.1.

[The-Compiler]

This looks like pyreadline/pyreadline#38 which indeed mentions that's fixed in pyreadline 2.1.

[nicoddemus]

Thanks @codewarrior0 and @The-Compiler for the info... @BookOwl could you try updating and see if that solves the issue?

[BookOwl]

I updated pyreadline, and py.test now works. Thanks for the help.