State use of pep and pip

Uses of Pep : 

This PEP proposes that the Installing Python Modules guide be updated to officially recommend the use of pip as the default installer for Python packages, rather than the current approach of recommending the direct invocation of the setup.py install command.

Use of Pip :

pip has been chosen as the preferred default installer, as it is an already popular tool that addresses several design and user experience issues with its predecessor easy_install (these issues can't readily be fixed in easy_install itself due to backwards compatibility concerns). pip is also well suited to working within the bounds of a single Python runtime installation (including associated virtual environments), which is a desirable feature for a tool bundled with CPython.

Other tools like zc.buildout and conda are more ambitious in their aims (and hence substantially better than pip at handling external binary dependencies), so it makes sense for the Python ecosystem to treat them more like platform package managers to interoperate with rather than as the default cross-platform installation tool. This relationship is similar to that between pip and platform package management systems like apt and yum (which are also designed to handle arbitrary binary dependencies).

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