Explain pickling and unpickling in python.

Pickling and Unpickling:

• Pickle is a standard module which serializes and deserializes a python object structure.
• Pickle module accepts any python object, converts it into a string representation and dumps into a file(by using dump() function ) which can be used later this process is called pickling.
• Unpickling is a process of retrieving original python object from the stored string representation for use.
• Pickling is a process whereby a python object hierarchy is converted into a byte stream and unpickling is the inverse operation, whereby a byte stream is converted back into an object hierarchy.
• Ex:

import pickle

a = [ "apple" , "banana" ]

file_Name = "abc"

# open the file for writing

fileObj = open( file_Name , "wb" )

# This writes the object a to the file

pickle.dump( a , fileObj)

fileObj.close()

fileObj = open( file_Name , "r")

# load the object from the file into variable

b = pickle.load( fileObj )

print( a == b )  # True