Pickling a dictionary and then unpickling it

Pickling.py

import pickle
from random import randint
from datetime import datetime

# LINES 6-18 ARE USED TO PICKLE SOMETHING TO DISK
present = datetime.now()

data_dict = {
    'voltage': randint(1,5),
    'current': randint(1,5),
    'resistance': randint(1,3),
    'timestamp': str(present.strftime('%d/%M/%Y %H:%m:%s'))
}

with open('sample.pickle', 'wb') as file:
    pickle.dump(data_dict, file)

print('Saved')

# LINES 21 ONWARDS ARE USED TO UNPICKLE SOMETHING
with open('sample.pickle', 'rb') as file:
    data_dict = pickle.load(file)

print(data_dict)
print(data_dict['voltage'])