dup.py

#!/usr/bin/env python

from __future__ import print_function
import os
import sys
from collections import Counter

all_files = []
for path, dirs, files in os.walk("."):
  all_files.extend(os.path.join(path, x) for x in files if x.endswith(".py"))

exclusions = { "", "{", "}", "'''", '"""',"},",
 "else:",
}
maxl = max(len(x) for x in all_files)

for fname in all_files:
  with open(fname) as f:
    lines = [x.strip() for x in f.readlines()]
    lines = [x for x in lines if not x in exclusions]
  c = Counter(lines)
  for key, n in c.items():
    if n == 1:
      continue
    print("{:3d}".format(n), fname.ljust(maxl), key)