retrieve a single file instead of doing a git clone code example

Example 1: git checkout single file

git fetch
git checkout origin/master -- path/to/file

Example 2: clone a single file in git

You can get that file using wget:

Create a directory:

 mkdir mypycode
Change into that directory:

 cd mypycode
Identify the raw URL

Navigate to your file on github (or your git host)
Click on the Raw tab.
Use wget to download it:

 wget <url in the browser>