Data Science Essentials in Python

Unit 12

Pickling and Unpickling Data

The module pickle implements serialization—saving arbitrary Python data structures into a file and reading them back as a Python expression. You can read a pickled expression from the file with any Python program, but not with a program written in another language (unless an implementation of the pickle protocol exists in that language).

You must open a pickle file for reading or writing in binary mode:

# Dump an object into a file
with open("myData.pickle", "wb") as oFile:
  pickle.dump(object, oFile)

# Load the same object back
with open("myData.pickle", "rb") as iFile:
  object = pickle.load(iFile)

You can store more than one object in a pickle file. The function load either ...