How to Install `multidict` in Python

v6.7.1 General Purpose Python >=3.9 Apache License 2.0

multidict implementation

Install pip install multidict

What is multidict?

multidict implementation

Multidict is dict-like collection of key-value pairs where key might occur more than once in the container.

HTTP Headers and URL query string require specific data structure: multidict. It behaves mostly like a regular `` but it may have several values for the same key and preserves insertion ordering.

The key is `` for case-insensitive dictionaries).

Documentation → PyPI page → Author: Andrew Svetlov

Quick Start

Minimal example to get started with multidict:

import multidict

print(multidict.__version__)

Installation

pip (standard)

pip install multidict

Virtual environment (recommended)

python -m venv venv
source venv/bin/activate   # Windows: venv\Scripts\activate
pip install multidict

pip3

pip3 install multidict

conda

conda install -c conda-forge multidict

Poetry

poetry add multidict

Dependencies

Installing multidict will also install these packages:

typing-extensions

Verify the Installation

After installing, confirm the package is available:

python -c "import multidict; print(multidict.__version__)"

If this prints a version number, installation succeeded. If you see a ModuleNotFoundError, see the errors section below.

Installation Errors

Common errors when installing multidict with pip.

ModuleNotFoundError: No module named 'multidict'

Cause: The package is not installed in the current Python environment.

Fix: Run pip install multidict. If using a virtual environment, ensure it is activated first.

ModuleNotFoundError: No module named 'multidict' (installed but still failing)

Cause: pip installed the package into a different Python than the one running your script.

Fix: Use python -m pip install multidict to install into the interpreter you are running.

ImportError: cannot import name 'X' from 'multidict'

Cause: The function or class does not exist in the installed version.

Fix: Check the version with pip show multidict and upgrade with pip install --upgrade multidict.

pip: command not found

Cause: pip is not in PATH or Python was not added to PATH during installation.

Fix: Try python -m pip install multidict. On macOS/Linux try pip3.

PermissionError: [Errno 13] Permission denied

Cause: No write access to the system Python package directory.

Fix: Use a virtual environment, or add --user: pip install --user multidict

SSL: CERTIFICATE_VERIFY_FAILED

Cause: pip cannot verify PyPI's SSL certificate — common behind corporate proxies.

Fix: Try: pip install --trusted-host pypi.org --trusted-host files.pythonhosted.org multidict

Recent Releases

Version	Released
`6.7.1` latest	2026-01-26
`6.7.0`	2025-10-06
`6.6.4`	2025-08-11
`6.6.3`	2025-06-30
`6.6.1`	2025-06-28

Full release history on PyPI →

Manage multidict

Upgrade to latest version

pip install --upgrade multidict

Install a specific version

pip install multidict==6.7.1

Uninstall

pip uninstall multidict

Check what is installed

pip show multidict

Last updated: 2026-04-11 • Data from PyPI

How to Install multidict in Python