AttributeError: module 'py' has no attribute 'builtin'

[bfortuner]

Installation of pytest not working on Ubuntu 14.04 with python 3.6.2. I tried installing pytest with both my OS's vanilla python install and a pyenv virtual install. I used the command pip install -U pytest. I receive the following error when I try to import pytest or run pytest --version.

Traceback (most recent call last):
  File "/home/bfortuner/.pyenv/versions/3.6.2/bin/pytest", line 7, in <module>
    from pytest import main
  File "/home/bfortuner/.pyenv/versions/3.6.2/lib/python3.6/site-packages/pytest.py", line 10, in <module>
    from _pytest.fixtures import fixture, yield_fixture
  File "/home/bfortuner/.pyenv/versions/3.6.2/lib/python3.6/site-packages/_pytest/fixtures.py", line 12, in <module>
    from py._code.code import FormattedExcinfo
  File "/home/bfortuner/.pyenv/versions/3.6.2/lib/python3.6/site-packages/py/_code/code.py", line 7, in <module>
    reprlib = py.builtin._tryimport('repr', 'reprlib')
AttributeError: module 'py' has no attribute 'builtin'

Output of pip freeze:

atomicwrites==1.1.5
attrs==18.1.0
certifi==2018.4.16
more-itertools==4.2.0
pipenv==2018.6.25
pluggy==0.6.0
py==1.5.3
pytest==3.6.2
six==1.11.0
virtualenv==16.0.0
virtualenv-clone==0.3.0

[pytestbot]

GitMate.io thinks possibly related issues are #448 (pytest-xdist: AttributeError: 'module' object has no attribute 'all'), #1161 (AttributeError: 'module' object has no attribute 'epoll'), #1447 (AttributeError: 'OutputWriter' object has no attribute 'isatty'), #555 (AttributeError: '_io.FileIO' object has no attribute 'errors'), and #1944 (AttributeError: 'Module' object has no attribute '_obj').

[bfortuner]

Turns out there was a 'py' module on my path somewhere screwing me up. I updated by PATH and the error went away!

[hanzhuoran]

Could you elaborate what you did to fix this?
I have encountered the same problem on pytest.

[RonnyPfannschmidt]

removal of the conflicting "py" module