How can mypy ignore a single line in a source file?

Question

I’m using mypy in my python project for type checking. I’m also using PyYAML for reading and writing the project configuration files. Unfortunately, when using the recommended import mechanism from the PyYAML documentation this generates a spurious error in a try/except clause that attempts to import native libraries:

from yaml import load, dump
try:
    from yaml import CLoader as Loader, CDumper as Dumper
except ImportError:
    from yaml import Loader, Dumper

On my system CLoader and CDumper aren’t present, which results in the errors error: Module 'yaml' has no attribute 'CLoader' and error: Module 'yaml' has no attribute 'CDumper'.

Is there a way to have mypy ignore errors on this line? I was hoping that I could do something like this to have mypy skip that line:

from yaml import load, dump
try:
    from yaml import CLoader as Loader, CDumper as Dumper  # nomypy
except ImportError:
    from yaml import Loader, Dumper

Asked By: Pridkett

||

Source

Answer 1

You can ignore type errors with # type: ignore as of version 0.2 (see issue #500, Ignore specific lines):

PEP 484 uses # type: ignore for ignoring type errors on particular lines …

Also, using # type: ignore close to the top of a file [skips] checking that file altogether.

_{Source: mypy#500. See also the mypy documentation.}

Answered By: Salem

Answer 2

Also # mypy: ignore-errors at the top of the file you want to ignore all errors works, if you are using shebang and coding lines should be like this:

#!/usr/bin/env python 
#-*- coding: utf-8 -*-
# mypy: ignore-errors

Gvanrossum comment

Answered By: Alan Garrido

Answer 3

Of course, the answer of this question is add # type:ignore at the end of the line that want mypy to ignore it.

When I was google for how to ignore the files for django migrations,
this question was recomment to me several times.

So I post an answer about how to ignore Django migrations:

# mypy.ini
[mypy-*.migrations.*]
ignore_errors = True

And for mypy>=0.910, pyproject.toml is supported which can be set as follows:

[tool.mypy]
python_version = 3.8
ignore_missing_imports = true

[[tool.mypy.overrides]]
module = "*.migrations.*"
ignore_errors = true

Answered By: Waket Zheng

Answer 4

I used

# type: ignore # noqa: F401

to ignore one line that was giving me F401 error. I am sure you can expand it to other error codes

Answered By: Areza

How can mypy ignore a single line in a source file?

Question:

Answers: