How to Install `parameterized` in Python

v0.9.0 General Purpose Python >=3.7 FreeBSD

Parameterized testing with any Python test framework

Install pip install parameterized

What is parameterized?

Parameterized testing with any Python test framework

`` fixes that. For everything. Parameterized testing for nose, parameterized testing for py.test, parameterized testing for unittest.

# testmath.py from nose.tools import assertequal from parameterized import parameterized, parameterizedclass

PyPI page → Author: David Wolever <david@wolever.net>

Quick Start

Minimal example to get started with parameterized:

import parameterized

print(parameterized.__version__)

Installation

pip (standard)

pip install parameterized

Virtual environment (recommended)

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

pip3

pip3 install parameterized

conda

conda install -c conda-forge parameterized

Poetry

poetry add parameterized

Verify the Installation

After installing, confirm the package is available:

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

ModuleNotFoundError: No module named 'parameterized'

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

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

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

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

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

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

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 parameterized. 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 parameterized

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 parameterized

Recent Releases

Version	Released
`0.9.0` latest	2023-03-27
`0.8.1`	2021-01-09
`0.7.5`	2021-01-04
`0.7.4`	2020-04-14
`0.7.2`	2020-04-12

Full release history on PyPI →

Manage parameterized

Upgrade to latest version

pip install --upgrade parameterized

Install a specific version

pip install parameterized==0.9.0

Uninstall

pip uninstall parameterized

Check what is installed

pip show parameterized

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

How to Install parameterized in Python