Unpickling

Unpickling means retrieving the data from the pickle file. In the previous topic, you learned how to store (list, dictionary) data in the pickle file; now it's time to retrieve the stored data. In order to perform unpickling, we will use pickle.load(). The pickle.load() takes one file object as an argument.

Let's see the program:

import pickle
pickle_file = open("emp1.dat",'r')
name_list = pickle.load(pickle_file)
skill_list =pickle.load(pickle_file)
print name_list ,"n", skill_list

Let's understand the program line by line. The pickle_file = open("emp1.dat",'r') syntax creates a file object in read mode. The name_list = pickle.load(pickle_file) syntax reads the first pickled object in the file and unpickles it to produce the ['mohit', 'bhaskar', 'manish'] list. Similarly,  skill_list =pickle.load(pickle_file) reads the second pickled object in the file and unpickles it to produce the ['Python', 'Python', 'Java'] list.

Let's see the output to clear up any confusion:

Output of filepickle2...