PIP notes

pip is a package installer python, it can be use to install packages fro the python packages index.

1. Documentation
2. PyPI
3. GitHub

Check if pip is install

pip is already installed in python 2 and python 3, but we can double check the version in the following way:

python -m pip --version

Installation

There are two was to install packages using pip one will be for machines with access to a network and other without access

python -m pip <pip arguments>

With access to a network

We can install packages like:

python -m pip install SomePackage

Normally we will be able to use:

pip install SomePackage

Without access to network

We can download the packages from PyPI or obtained elsewhere, and installed in the following way:

python -m pip install SomePackages-1.0-py2.py3-none-any.whl

Installation of specific version of the packages

python -m pip install SomePackage            # latest version
python -m pip install SomePackage==1.0.4     # specific version
python -m pip install 'SomePackage>=1.0.4'     # minimum version

Get packages installed

to get a list of packages and versions install in a machine we can use

pip freeze  > requirements.txt

with the previous command we will get all the packages and save it in the document requirements.txt file

Uninstall packages

For uninstall packages:

pip uninstall SomePackages

to uninstall all the packages

pip freeze | xargs pip uninstall -y

or

pip uninstall -r requirements.txt

it will ask if we want to uninstall one by one. to uninstall everything

pip uninstall -r requirements.txt -y