How to Use requirements.txt for Python Dependencies
Updated: February 2026
The requirements.txt file lists Python package dependencies for projects. This file enables easy installation of all required packages with one command, ensuring consistent environments across different systems.
Opening requirements.txt
Plain text file containing package names and versions. Open with any text editor.
File Format
Simple format, one package per line:
requests==2.28.0
numpy>=1.20.0
flask
django==4.0.*
pandas
==
specifies exact version,
>=
minimum version, no operator means latest version.
Installing Dependencies
With Python and pip installed, run:
pip install -r requirements.txt
This installs all listed packages automatically. Use virtual environments to isolate project dependencies.
Creating requirements.txt
Generate from current environment:
pip freeze > requirements.txt
This captures all installed packages with exact versions. Edit manually to include only project dependencies.
Best Practices
Pin versions for reproducible builds (
package==1.2.3
). Keep requirements.txt updated when adding packages. Use virtual environments (venv) to avoid conflicts between projects.
Alternative: pyproject.toml
Modern Python projects use
pyproject.toml
with Poetry or other tools for advanced dependency management.
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