Handling files with pickles.

test_pickle.py

import pickle

a,b,c,d=[1],[3],[5],[7]
a.append(2)
b.append(4)
c.append(6)
d.append(8)

with open('test.pk','wb') as fo:
  pickle.dump(a,fo)
  pickle.dump(b,fo)
  pickle.dump(c,fo)
  pickle.dump(d,fo)

with open('test.pk', "rb") as f:
  while True:
    try:
      #Insert your code to handle the pickles.
      print pickle.load(f)
    except EOFError:
      break