pip Requirements and Locking Cheat Sheet

python -m pip install --require-hashes -r requirements.txt

# Require hash verification for all requirements.

python -m pip download -r requirements.txt -d ./wheelhouse

# Download all requirements into a local artifact directory.

python -m pip install --no-index --find-links ./wheelhouse -r requirements.txt

# Install from local artifacts without contacting indexes.

python -m pip install --no-deps ./dist/my_package.whl

# Skip resolver dependency installation.

python -m pip install pandas -c constraints.txt

# Apply version constraints to a direct install.

# requirements-dev.txt
-r requirements.txt
pytest
black
ruff

# Example pattern for base + dev requirement layering.

urllib3==2.2.2
charset-normalizer==3.3.2
idna==3.7

# Show a constraints file with exact pins.

python -m pip install -r requirements.txt --report pip-report.json

# Write a structured report during installation.

python -m pip freeze | sort > requirements.lock.txt

# Create a sorted requirements snapshot.

python -m pip list --format=json

# Output installed packages in JSON format.