You can install Python packages from source code repositories. This is really useful when you do not want to insert an extra step of creating and uploading a package to the PyPI repository. Most notably, it’s most useful to download your packages from your GitHub source repository.
20180824/https://pip.pypa.io/en/stable/reference/pip_install/#vcs-support
Want to install Python packages into a virtual environment, but still be able to develop them with ease? Look here for the documentation on so-called “editable” installs that allows you to do this.
20180824/https://pip.pypa.io/en/stable/reference/pip_install/#editable-installs
20180824/https://setuptools.readthedocs.io/en/latest/setuptools.html#development-mode