pickle_append_sample.py

# To support the append (postscript) of the filewrite in pickle.
import pickle

# test data
data = ['this','is','a','test','.']
appendix = ['this','is','appendix','.']

def load_dumps(f):
  obj = []
  while 1:
    try:
      obj.append(pickle.load(f))
    except:
      break
  return obj


if __name__ == '__main__':
  print('raw data:\n'+str(data))
  # serialize
  with open('pickle_test.dump', 'wb') as f:
    pickle.dump(data, f)

  # deserialize
  with open('pickle_test.dump', 'rb') as f:
    data = pickle.load(f)
  
  print('pickle data:\n'+str(data))
  
  # try append
  with open('pickle_test.dump', 'ab') as f:
    pickle.dump(appendix, f)
  
  # deserialize for appended dumps
  with open('pickle_test.dump', 'rb') as f:
    data = load_dumps(f)
  
  print('appended pickle data:\n'+str(data))