Remotely controlling the Raspberry Pi

The advantage of connecting the Pi is that it can supply the power for the Pi and it doesn’t require the keyboard, mouse or display attached to the Pi separately.

Step by step procedure is as follows:

You can enable/disable the serial console with either editing /boot/config.txt or raspi-config (which will edit /boot/config.txt for you)

Option 1. Enabling in /boot/config.txt

You can pop your SD card into a computer and edit config.txt with a text editor like SimpleText, WordPad or whatnot. You can also edit on a pi with sudo nano /boot/config.txt

At the bottom, last line, add enable_uart=1 on it's own line

Option 2. Enabling via Raspi-Config

Using a monitor and keyboard, log into the shell and run

sudo raspi-config

go down to Advanced Options

Hit enter and then go down to Serial

Select Yes

It should now be enabled

Hit return then select Finish

When it asks you to reboot, go to Yes and hit return

the serial console is now enabled! 
Now try connecting it to the PC with the USB port and the appropriate USB driver is enabled.Once the driver is enabled the PuttY command prompt is open after which the program in python will be accessed by the Raspberry Pi.