how to encrypt text in python

1from cryptography.fernet import Fernet
2message = "my deep dark secret".encode()
3
4f = Fernet(key)
5encrypted = f.encrypt(message)
6

1# encrypting
2from cryptography.fernet import Fernet
3message = "my deep dark secret".encode()
4
5f = Fernet(key)
6encrypted = f.encrypt(message)
7# decrypting
8from cryptography.fernet import Fernet
9encrypted = b"...encrypted bytes..."
10
11f = Fernet(key)
12decrypted = f.decrypt(encrypted)

1text = input()
2
3def encrypt(t):
4    chars = list(text)
5    allowed_characters = list(" abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789,.?!")
6
7    for char in chars:
8        for i in allowed_characters:
9            if char == i:
10                chars[chars.index(char)] = allowed_characters.index(i)
11    return chars
12
13print(encrypt(text))

1from cryptography.fernet import Fernet
2
3def generate_key():
4    """
5    Generates a key and save it into a file
6    """
7    key = Fernet.generate_key()
8    with open("secret.key", "wb") as key_file:
9        key_file.write(key)
10
11def load_key():
12    """
13    Load the previously generated key
14    """
15    return open("secret.key", "rb").read()
16
17def encrypt_message(message):
18    """
19    Encrypts a message
20    """
21    key = load_key()
22    encoded_message = message.encode()
23    f = Fernet(key)
24    encrypted_message = f.encrypt(encoded_message)
25
26    print(encrypted_message)
27
28if __name__ == "__main__":
29    encrypt_message("encrypt this message")
30