To install GDAL Library:
Go to the this site from Christoph Gohlke. This site provides you with lots of unofficial windows binaries python extension packages. Packages are alphabetically ordered and since we need GDAL for python, scroll down to GDAL section. Which appears like below:
You can see the [GDAL version] [Python version] [architecture]
You first check your architecture version of your pc whether 64-bit or 32-bit version. Determine your python version and its already 2.7.x version and GDAL version you want.
Download .whl file and place it in a local drive folder as you want.
Run command prompt. Change directory to where you have put the .whl file. Mine is as shown:
My command prompt look like:
Then type: pip install GDAL-2.1.3-cp27-cp27m-win_amd64.whl on command prompt as below:
In my case GDAL is already installed so it says requirement is already made. In your case try these, you ll get GDAL installed.