使用Python实现Windows下的文件加密解密功能

本示例代码演示了如何使用Python编写一个文件加密解密的程序，可以在Windows操作系统下运行。通过该程序，用户可以选择加密某个文件并生成加密后的文件，同时也可以选择解密已加密的文件。

import os
from cryptography.fernet import Fernet

class Encryptor:
    def __init__(self, key):
        self.key = key

    def encrypt_file(self, file_path):
        with open(file_path, 'rb') as file:
            data = file.read()

        fernet = Fernet(self.key)
        encrypted_data = fernet.encrypt(data)

        encrypted_file_path = file_path + '.enc'
        with open(encrypted_file_path, 'wb') as encrypted_file:
            encrypted_file.write(encrypted_data)

    def decrypt_file(self, encrypted_file_path):
        with open(encrypted_file_path, 'rb') as encrypted_file:
            data = encrypted_file.read()

        fernet = Fernet(self.key)
        decrypted_data = fernet.decrypt(data)

        decrypted_file_path = os.path.splitext(encrypted_file_path)[0]
        with open(decrypted_file_path, 'wb') as decrypted_file:
            decrypted_file.write(decrypted_data)

# Generate a key using Fernet
key = Fernet.generate_key()

# Perform encryption
encryptor = Encryptor(key)
encryptor.encrypt_file('example.txt')

# Perform decryption
encrypted_file_path = 'example.txt.enc'
encryptor.decrypt_file(encrypted_file_path)

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