load and save method example

class_load_save_methods.py

import pickle
import os
from functools import partial

def function(text , a = 3):
    print('this is a function with text {0}  and a = {1}'.format(text , a))

class Test(object):
    """  """
    
    def __init__(self):
        """ Constructor for Test"""
        self.a = 14
        self.b = 12
        self.c = partial(function , a=3)

        if os.path.exists("file_name.txt"):
            self = Test.load()

    def save(self):
        with open('file_name.txt','wb') as f:
            pickle.dump(self,f)

    @classmethod
    def load(cls):
        with open('file_name.txt' ,'rb') as f:
            obj = pickle.load(f)
        return obj

if __name__ == '__main__':
    
    test_1 = Test()
    print(test_1.a)
    print(test_1.b)
    test_1.c("test")


    test_1.save()

    test_2 = Test.load()
    print(test_2.a)
    print(test_2.b)
    test_1.c("thing")

    test_3 = Test()
    print(test_3.a)
    print(test_3.b)
    test_3.c("thing")