import sys
sys.path.append('./markdown-1.7')
from markdown import Markdown

sys.path.append('./markdown-1.7')
from markdown import Markdown

When you want to import a python file but that file is not in the same directory as the python file you're importing _from_ (e.g. it's in a subdir). You need to add the directory that contains the file you want to import to your path environment variable `sys.path`. `sys.path` contains all the places python will look for a file when you do an import.

Import a file from a directory

Python