import os, os.path
fileiter = (os.path.join(root, f) for root, _, files in os.walk(dirtocheck) for
    f in files)
smallfileiter = (f for f in fileiter if os.path.getsize(f) < 200 * 1024)
for small in smallfileiter:
    os.remove(small)
Python script to loop through all files in directory, delete any that are less than 200 kB in size