How can I iterate over files in a given directory?

Question

I need to iterate through all .asm files inside a given directory and do some actions on them.

How can this be done in a efficient way?

Answer 1

This will iterate over all descendant files, not just the immediate children of the directory:

import os

for subdir, dirs, files in os.walk(rootdir):
    for file in files:
        #print os.path.join(subdir, file)
        filepath = subdir + os.sep + file

        if filepath.endswith(".asm"):
            print (filepath)