Install a package and write to requirements.txt with pip

$ pip freeze > requirements.txt
$ pip install -r requirements.txt

References :

Cookbook — pip 1.5.2 documentation 

Upload your package PyPI

PyPI — the Python Package Index

Create your accounts

PyPI Live 

PyPI Test

Create a .pypirc configuration file

[distutils] # this tells distutils what package indexes you can push to

    index-servers =

        PyPI # the live PyPI

        PyPI-test # test PyPI

 

    [PyPI] # authentication details for live PyPI

    repository: https://PyPI.python.org/PyPI

    username: {{your_username}}

    password: {{your_password}}

 

    [PyPI-test] # authentication details for test PyPI

    repository: https://testPyPI.python.org/PyPI

    username: {{your_username}}

Prepare your package

root-dir/   # arbitrary working directory name

        setup.py

        setup.cfg

        LICENSE.txt

        README.md

        mypackage/

            __init__.py

            foo.py

            bar.py

            baz.py

setup.py

from distutils.core import setup

    setup(

        name = 'mypackage',

        packages = ['mypackage'], # this must be the same as the name above

        version = '0.1',

        description = 'A random test lib',

        author = 'Ajay',

        author_email = 'aj@gmail.com',

        url = 'https://github.com/ajkumar25/mypackage',   # use the URL to the github repo

        download_url = 'https://github.com/ajkumar25/mypackage/tarball/0.1', # I'll explain this in a second

        keywords = ['testing', 'logging', 'example'], # arbitrary keywords

        classifiers = [],

    )

setup.cfg

[metadata]

description-file = README.md

Register your package

$ python setup.py register -r PyPI-test

 

Upload your package

Upload to PyPI Test

$ python setup.py sdist upload -r PyPI-test

Upload to PyPI Live

$ python setup.py register -r PyPI

$ python setup.py sdist upload -r PyPI

References :
How to Create a Python Library | Pypix