Question

How to write and read class objects to binary file in Python

Answer 1

import pickle

class Product(object):
    def __init__(self, pcode, pname, price):
        self.pcode = pcode
        self.pname = pname
        self.price = price

with open('product_file.dat', 'wb') as output:
    obj1 = Product(98742, "Dell XPS 15 laptop 15.6 inch", 1964.43)
    pickle.dump(obj1, output, pickle.HIGHEST_PROTOCOL)

    obj2 = Product(67398, "Dell XPS 13 7390 Laptop 13.3 inch", 1499.99)
    pickle.dump(obj2, output, pickle.HIGHEST_PROTOCOL)

    obj3 = Product(79913, "Apple MacBook Pro 16-Inch 16GB RAM 1TB Storage", 2562.41)
    pickle.dump(obj3, output, pickle.HIGHEST_PROTOCOL)

del obj1
del obj2
del obj3

with open('product_file.dat', 'rb') as input:
    obj1 = pickle.load(input)
    print(obj1.pcode, obj1.pname, obj1.price)
    obj2 = pickle.load(input)
    print(obj2.pcode, obj2.pname, obj2.price)
    obj3 = pickle.load(input)
    print(obj3.pcode, obj3.pname, obj3.price)



'''
run:
 
98742 Dell XPS 15 laptop 15.6 inch 1964.43
67398 Dell XPS 13 7390 Laptop 13.3 inch 1499.99
79913 Apple MacBook Pro 16-Inch 16GB RAM 1TB Storage 2562.41

'''

 

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