As you all may know pip is a python package manager and everyone has worked with it to install python libs.

Some of the commands with pip that you may not know about it:

- freeze: output installed packages in requirements format. (you can grep and search for a specific package):

         rply==0.7.4
         rsa==3.2.3
         sasl==0.2.1
         scipy==0.13.0b1

- list: list installed packages:

tcpwatch (1.3.1)
         telebot (0.0.3)
         thrift (0.9.3)

- show: Show information about installed packages:

$ pip show pandas
         Name: pandas
         Version: 0.17.0
         Summary: Powerful data structures for data analysis, time series,and statistics
         Home-page: http://pandas.pydata.org
         Author: The PyData Development Team
         Author-email: pydata@googlegroups.com
         License: BSD
         Location: /Library/Python/2.7/site-packages
         Requires: numpy, python-dateutil, pytz

Important note for devops: pip by default install a stable version of the package. If you need to install an unstable version of the package (latest version) use --pre flag to install pre-release package.

If you want to manage your custom python repository package versions (RC, Alpha, Beta, Stable, etc) add classifiers to your setup.py script like below:

setup(...,
       classifiers=[
           'Development Status :: 4 - Beta',
           'Environment :: Console',
           'Environment :: Web Environment',
           'Intended Audience :: End Users/Desktop',
           'Intended Audience :: Developers',
           'Intended Audience :: System Administrators',
           'License :: OSI Approved :: Python Software Foundation License',
           'Operating System :: MacOS :: MacOS X',
           'Operating System :: Microsoft :: Windows',
           'Operating System :: POSIX',
           'Programming Language :: Python',
           'Topic :: Communications :: Email',
           'Topic :: Office/Business',
           'Topic :: Software Development :: Bug Tracking',
           ],
       )

The important part is Development Status :: 4 - Beta, which for stable release you would use Development Status :: 5 - Production/Stable.

To see list of pypi Development Status values read from the below link:
https://pypi.python.org/pypi?%3Aaction=list_classifiers

Now you can give versioning like Django 2.0b1 (for pre release) and Django 1.11.6 for stable release.
To see different classifiers see the link Django link below to learn more:
https://pypi.python.org/pypi/Django

#django #pip #pre_release #freeze #package #python #devops