comparing contents of two files using python

Question

I have a file name exclusionlist.txt and i have contents in it like

          import os
          import re
          import subprocess
          ......and many          


        

Answer 1

Use set intersection:

def readImports(path):
    with open(path) as f:
        for line in f:
            # lines of form "import ___,___"
            # assuming not of form "from ___ import ___ [as ___]"
            if 'import' in line:
                modules = line.split('import')[1]
                for module in modules.split(','):
                    yield module.strip()

linesInExclusion = set(readImports('exclusionlist.txt'))
linesInLibraries = set(readImports('libraries.txt'))

print(linesInExclusion.intersection(linesInLibraries))

You can do return (line.strip() for line in f if line.strip()!='') if you want to be perfect...