Encrypt and decrypt in python using own fixed key

[SriRajesh]

Hi I want to encrypt an d decrypt. But I want to use fixed defined key for example: key = "Abcd123". Can some one help how to do it. Thanks in advance. I use below code.

from cryptography.fernet import Fernet
message = "I am python" 
key = Fernet.generate_key()
fernet = Fernet(key)
encMessage = fernet.encrypt(message.encode())
print("original string: ", message)
print("encrypted string: ", encMessage)
decMessage = fernet.decrypt(encMessage).decode()
 
print("decrypted string: ", decMessage)