Cannot run mypy on the directory installed by `pip install -e .`

[miyakogi]

• Are you reporting a bug, or opening a feature request?

Reporting a bug.

• Please insert below the code you are checking with mypy,
  or a mock-up repro if the source is private. We would appreciate
  if you try to simplify your case to a minimal repro.

Execute pip install -e . in the directory which contains empty a.py file and setup.py file as below:

from setuptools import setup

setup(
    name='a',
    version='0.0.1',
    py_modules=['a'],
)

Then run mypy a.py.

• What is the actual behavior/output?

Output:

/path/to/current/dir is in the PYTHONPATH. Please change directory so it is not.

• What is the behavior/output you expect?

Run type check.

• What are the versions of mypy and Python you are using?
  Do you see the same issue after installing mypy from Git master?

Python: 3.6.5
Mypy: Latest git master (0.620+dev-f5058bcb269a55b33a02c3e3fd345541839bf06e)

[gvanrossum]

@ethanhs This is your recent diff... I've seen this too. We should fix it before releasing.

My case was simply running python3 -m mypy x.py where the current directory was the mypy repo, after pip3 install -e . there:

(v36) mypy$ pwd
/Users/guido/src/mypy
(v36) mypy$ python3 -m mypy _.py
_.py:10: error: Revealed type is 'builtins.dict[builtins.int, builtins.str*]'
_.py:11: error: Revealed type is 'builtins.str'
_.py:13: error: Revealed type is 'builtins.str'
_.py:13: error: Argument 1 to "maketrans" of "str" has incompatible type "Dict[str, str]"; expected "Union[Dict[int, Union[int, str, None]], Dict[str, Union[int, str, None]], Dict[Union[str, int], Union[int, str, None]]]"
(v36) mypy$ pip3 install -e .
Obtaining file:///Users/guido/src/mypy
Requirement already satisfied: typed-ast<1.2.0,>=1.1.0 in /Users/guido/v36/lib/python3.6/site-packages (from mypy==0.620+dev.f5058bcb269a55b33a02c3e3fd345541839bf06e.dirty) (1.1.0)
Installing collected packages: mypy
  Running setup.py develop for mypy
Successfully installed mypy
(v36) mypy$ python3 -m mypy _.py
/Users/guido/src/mypy is in the PYTHONPATH. Please change directory so it is not.
(v36) mypy$ 

[emmatyping]

Ah, yes, we can skip checking egg directories and this won't be a problem. Sorry for the issue. I've submitted #5318.

[sushobhit27]

getting same error on travis CI also.
pylint-dev/pylint#2338
https://travis-ci.org/PyCQA/pylint/jobs/407256954

Is this issue included in any release, I am unable to find any changelog.
my mypy version is:
$ mypy --version
mypy 0.620

[gvanrossum]

No, it will be in the next release. We close issues when they are fixed in master.

On Wed, Jul 25, 2018 at 3:10 AM Sushobhit ***@***.***> wrote: getting same error on travis CI also. pylint-dev/pylint#2338 <pylint-dev/pylint#2338> https://travis-ci.org/PyCQA/pylint/jobs/407256954 Is this issue included in any release, I am unable to find any changelog. my mypy version is: $ mypy --version mypy 0.620 — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#5316 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ACwrMpD9ucJp14btXVhZQR19yRTRbszeks5uKEQIgaJpZM4VB9si> .

-- --Guido (mobile)

[sushobhit27]

thanks @gvanrossum 👍
may I also know the best way to use mypy in tox, as currently I am getting 2 different errors using different approaches:
Case 1)
[testenv:mypy]
basepython = python3
deps =
mypy

commands =
mypy {envsitepackagesdir}/pylint --ignore-missing-imports

output:

$ tox -e mypy
GLOB sdist-make: /home/sussolan/git_repos/pylint_sandbox/pylint/setup.py
mypy inst-nodeps: /home/sussolan/git_repos/pylint_sandbox/pylint/.tox/dist/pylint-2.0.0.zip
WARNING:Discarding $PYTHONPATH from environment, to override specify PYTHONPATH in 'passenv' in your configuration.
mypy installed: astroid==2.0.1,isort==4.3.4,lazy-object-proxy==1.3.1,mccabe==0.6.1,mypy==0.620,pylint==2.0.0,six==1.11.0,typed-ast==1.1.0,wrapt==1.10.11
mypy runtests: PYTHONHASHSEED='1102972726'
mypy runtests: commands[0] | mypy /home/sussolan/git_repos/pylint_sandbox/pylint/.tox/mypy/lib/python3.6/site-packages/pylint --ignore-missing-imports
**/home/sussolan/git_repos/pylint_sandbox/pylint/.tox/mypy/lib/python3.6/site-packages is in the PYTHONPATH. Please change directory so it is not.**
ERROR: InvocationError for command '/home/sussolan/git_repos/pylint_sandbox/pylint/.tox/mypy/bin/mypy /home/sussolan/git_repos/pylint_sandbox/pylint/.tox/mypy/lib/python3.6/site-packages/pylint --ignore-missing-imports' (exited with code 1)
___________________________________________________________________________________________ summary ____________________________________________________________________________________________
ERROR:   mypy: commands failed

Case 2)
[testenv:mypy]
basepython = python3
deps =
mypy

commands =
mypy pylint --ignore-missing-imports

Output:

$ tox -e mypy
GLOB sdist-make: /home/sussolan/git_repos/pylint_sandbox/pylint/setup.py
mypy inst-nodeps: /home/sussolan/git_repos/pylint_sandbox/pylint/.tox/dist/pylint-2.0.0.zip
WARNING:Discarding $PYTHONPATH from environment, to override specify PYTHONPATH in 'passenv' in your configuration.
mypy installed: astroid==2.0.1,isort==4.3.4,lazy-object-proxy==1.3.1,mccabe==0.6.1,mypy==0.620,pylint==2.0.0,six==1.11.0,typed-ast==1.1.0,wrapt==1.10.11
mypy runtests: PYTHONHASHSEED='974673384'
mypy runtests: commands[0] | mypy pylint --ignore-missing-imports
**There are no .py[i] files in directory 'pylint'**
ERROR: InvocationError for command '/home/sussolan/git_repos/pylint_sandbox/pylint/.tox/mypy/bin/mypy pylint --ignore-missing-imports' (exited with code 1)
___________________________________________________________________________________________ summary ____________________________________________________________________________________________
ERROR:   mypy: commands failed

Case 3)
When mypy is directly executed on shell, it runs fine