Install types

When you run type checks with Mypy, you might get an error that types are missing for your installed 3rd-party packages.

So run a command below to install the missing types. If you can’t find appropriate types, see other pages in this guide to make stubs or ignore that package for typechecks.

See typeshed README for more info.

Install using Mypy

Interactive

$ mypy --install-types

Then you have to enter y and press Enter.

Sample console output:

Installing missing stub packages:
.../python3 -m pip install types-setuptools

Install? [yN] 

Non-interactive

Or simply do this:

$ mypy --install-types --non-interactive

Install using pip

If type stubs exist for a particular package, you can install them.

See types-requests on PyPI for this example.

Install using CLI

$ pip install types-requests

Based on:

Library stubs not installed for "requests" (or incompatible with Python 3.9)
...:13: note: Hint: "python3 -m pip install types-requests"
...:13: note: (or run "mypy --install-types" to install all missing stub packages)
...:13: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports

Install using requirements file

After you know what types you need, then you should switch to this approach with name added to your requirements-dev.txt file. Then everytime someone sets up your project on their machine, it will include types.

Set up the file with content like:
```
 types-requests
```
Install from it:
```
 $ pip install -r requirements-dev.txt
```