pip based python packages installation through proxy on Windows

For installing python packages through pip via proxy on Windows platform:

1) Create a directory: c:\Users\<User name>\pip
2) Then, create a file "pip.conf" in this directory with the following contents:

[global]
trusted-host = pypi.python.org
proxy = http://user:xxx@192.168.1.4:3128

Now, you are ready to install any python packages through pip:
c:\> pip install requests


Useful references:
1) https://stackoverflow.com/questions/28278207/python-cant-find-pip-ini-or-pip-conf-in-windows7
2) https://stackoverflow.com/questions/14149422/using-pip-behind-a-proxy