pip install mypy-extensions==0.4.3

Experimental type system extensions for programs checked with the mypy typechecker.

Source
Among top 100 packages on PyPI.
Over 83.6M downloads in the last 90 days.

Commonly used with mypy-extensions

Based on how often these packages appear together in public requirements.txt files on GitHub.

cfgv

Validate configuration and produce human readable error messages.

identify

File identification library for Python

toml

Python Library for Tom's Obvious, Minimal Language

iniconfig

iniconfig: brain-dead simple config-ini parsing

typing-extensions

Backported and Experimental Type Hints for Python 3.5+

importlib-metadata

Read metadata from Python packages

zipp

Backport of pathlib-compatible object wrapper for zip files

more-itertools

More routines for operating on iterables, beyond itertools

typed-ast

a fork of Python 2 and 3 ast modules with type comment support

importlib-resources

Read resources from Python packages

distlib

Distribution utilities

black

The uncompromising code formatter.

atomicwrites

Atomic file writes.

aspy.yaml

A few extensions to pyyaml.

jeepney

Low-level, pure Python DBus protocol wrapper.

readme-renderer

readme_renderer is a library for rendering "readme" descriptions for Warehouse

shellingham

Tool to Detect Surrounding Shell

pluggy

plugin and hook calling mechanisms for python

requests-toolbelt

A utility belt for advanced users of python-requests

Version usage of mypy-extensions

Proportion of downloaded versions in the last 3 months (only versions over 1%).

0.4.3

99.74%