How to Install `cachetools` in Python

v7.0.5 General Purpose Python >=3.10

Extensible memoizing collections and decorators

Install pip install cachetools

What is cachetools?

Extensible memoizing collections and decorators

This module provides various memoizing collections and decorators, including variants of the Python Standard Library's function decorator.

from cachetools import cached, LRUCache, TTLCache

# speed up calculating Fibonacci numbers with dynamic programming @cached(cache={}) def fib(n): return n if n < 2 else fib(n - 1) + fib(n - 2)

PyPI page → Author: Thomas Kemmer <tkemmer@computer.org>

Quick Start

Minimal example to get started with cachetools:

import cachetools

print(cachetools.__version__)

Installation

pip (standard)

pip install cachetools

Virtual environment (recommended)

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

pip3

pip3 install cachetools

conda

conda install -c conda-forge cachetools

Poetry

poetry add cachetools

Verify the Installation

After installing, confirm the package is available:

python -c "import cachetools; print(cachetools.__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 cachetools with pip.

ModuleNotFoundError: No module named 'cachetools'

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

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

ModuleNotFoundError: No module named 'cachetools' (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 cachetools to install into the interpreter you are running.

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

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

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

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 cachetools. 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 cachetools

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 cachetools

Recent Releases

Version	Released
`7.0.5` latest	2026-03-09
`7.0.4`	2026-03-08
`7.0.3`	2026-03-05
`7.0.2`	2026-03-02
`7.0.1`	2026-02-10

Full release history on PyPI →

Manage cachetools

Upgrade to latest version

pip install --upgrade cachetools

Install a specific version

pip install cachetools==7.0.5

Uninstall

pip uninstall cachetools

Check what is installed

pip show cachetools

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

How to Install cachetools in Python