Multiple Errors while execution of Tests

Environment

• pip version: 19.3.1
• Python version: 3.7.3
• OS: Fedora 29

Description Tried Executing very first command $tox -e py36

Expected behavior A Good success message

How to Reproduce Maybe some environment issue, or some command is missing.

1. Installed Tox
2. Then Installed Python3.8
3. Then Executed $tox -e py3.7 >> error.txt

Output

Attached Output File
[error.txt](https://github.com/pypa/pip/files/4035602/error.txt)

[uranusjr]

Hmm, I just checked this on a fresh Fedora 29 Docker image:

>>> import subprocess
>>> subprocess.check_call(['asdasdfdgfgfg'])
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib64/python3.7/subprocess.py", line 342, in check_call
    retcode = call(*popenargs, **kwargs)
  File "/usr/lib64/python3.7/subprocess.py", line 323, in call
    with Popen(*popenargs, **kwargs) as p:
  File "/usr/lib64/python3.7/subprocess.py", line 775, in __init__
    restore_signals, start_new_session)
  File "/usr/lib64/python3.7/subprocess.py", line 1522, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'asdasdfdgfgfg': 'asdasdfdgfgfg'

So it seems the stdlib is doing the correct thing by default, and the NotADirectory exception you get is indeed an environment problem. I don’t know what it is though. 😦

[uranusjr]

The two errors are the same, something like

FileNotFoundError: [Errno 2] No such file or directory: "/tmp/pytest-of-deepshar/pytest-13/test_freeze_mercurial_clone0/workspace/scratch/pip-test-package/*** failed to import extension hgext.qct: missing attributes: norepo, optionalrepo, inferrepo\n*** (use @command decorator to register '^qct|commit-tool')\n/tmp/pytest-of-deepshar/pytest-13/test_freeze_mercurial_clone0/workspace/scratch/pip-test-package"

I believe they are tracked in #7545.