有时候我们手中文件的内容十分的重要、十分地机密，我们可以选择对此进行加密，代码如下：

from cryptography.fernet import Fernet
 
def encrypt(filename, key):
    fernet = Fernet(key)
    with open(filename, 'rb') as file:
        original = file.read()
    encrypted = fernet.encrypt(original)
    with open(filename, 'wb') as enc_file:
        enc_file.write(encrypted)
         
key = Fernet.generate_key()
filename = "file.txt"
encrypt(filename, key)

我们生成密钥，然后对文件内容进行加密，当然这个密钥后面在对文件进行解密的时候会派上用场，因此密钥一定要保存完好，解密的代码如下：

def decrypt(filename, key):
    fernet = Fernet(key)
    with open(filename, 'rb') as enc_file:
        encrypted = enc_file.read()
    decrypted = fernet.decrypt(encrypted)
    with open(filename, 'wb') as dec_file:
        dec_file.write(decrypted)
 
decrypt(filename, key)

上面的脚本，其中的密钥是一个随机生成的随机数，当然密钥也可以是我们自己指定的，代码如下：

import pyAesCrypt
 
def Encryption(input_file_path, output_file_path, key):
    pyAesCrypt.encryptFile(input_file_path, output_file_path, key)
    print("File has been decrypted")
 
def Decryption(input_file_path, output_file_path, key):
    pyAesCrypt.decryptFile(input_file_path, output_file_path, key)
    print("File has been decrypted")