You can use the os.walk function to walk through the directory tree in python.
example
import os
for dirpath, dirs, files in os.walk("./my_directory/"):
for filename in files:
fname = os.path.join(dirpath,filename)
with open(fname) as myfile:
print(myfile.read())The above program recursively moves through the my_directory tree and prints contents of each file in the tree to the console output.