main.py

from cryptography.fernet import Fernet

key = Fernet.generate_key()
print(key)

cipher = Fernet(key)
text = b'Hi everyone!!! This is me again!!!'

secured_text = cipher.encrypt(text)
print(secured_text)

decrypted_text = cipher.decrypt(secured_text)
print(decrypted_text)

# ----------------------------------------------------

with open('my_key.txt', 'wb') as f:
    f.write(key)

text_to_secure = open('stih.txt', 'rb').read()
print(text_to_secure)

with open('my_secured_text.txt', 'wb') as f:
    f.write(cipher.encrypt(text_to_secure))

text_to_unsecure = open('my_secured_text.txt', 'rb').read()
print(text_to_unsecure)

with open('my_unsecured_text.txt', 'wb') as f:
    f.write(cipher.decrypt(text_to_unsecure))