[Python] pip - export package list and restore

 Python   pip   restore 

▌Introduction

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In this article, we will use pip to export a project’s installed package list and restore them in another project.

▌Environment

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▋Git bash

▋Python 3.6.2

▋Git bash

▌Implement

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▋Where are the installed packages?

They are in ~/Lib/site-packages of the virtual environment.

For a global or per-user site-packages, use the following command.

1.Global site-packages

$ python –m site

2.per-user (where Python installs the local packages)

$ python -m site --user-site

▋Export the packages list

▋List installed packages

$  pip list

▋Export installed packages

$ pip freeze --local > requirements.txt

▋Restore

Now we have another new project and we would like to restore the packages from requirments.txt.

▋pip is required

If pip is not installed, follow DOC: installation to install it.

For example, get get-pip.py and execute it by $ python get-pip.py

▋Restore

Copy the requirements.txt to the new project and execute the following command.

$ pip install -r requirements.txt --force-reinstall

--force-reinstall: Reinstall all packages even if they are already up-to-date.

OR

$ pip install -r requirements.txt --ignore-installed

--ignore-installed: Ignore the installed packages/files

▌Reference

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▋pip list — pip 9.0.1 documentation

▋pip freeze — pip 9.0.1 documentation