Python中如何实现文件压缩？压缩时如何设置密码保护？

import zipfile
import os

def compress_with_password(file_path, zip_path, password):
    """
    使用zipfile压缩文件并设置密码。
    注意：zipfile的加密方式相对简单，不适用于高安全性场景。
    """
    try:
        with zipfile.ZipFile(zip_path, 'w', zipfile.ZIP_DEFLATED, compresslevel=9) as zf:
            zf.setpassword(password.encode()) # 密码必须是bytes类型
            zf.write(file_path, os.path.basename(file_path))
        print(f"文件 {file_path} 成功压缩为 {zip_path}，并设置密码。")
    except Exception as e:
        print(f"压缩过程中发生错误：{e}")


# 示例
file_to_compress = "example.txt" # 替换为你的文件路径
zip_archive_path = "example.zip" # 替换为你想要保存的zip文件路径
encryption_password = "MySecretPassword" # 替换为你想要设置的密码

# 创建一个示例文件
with open(file_to_compress, "w") as f:
    f.write("This is a sample file to be compressed.")

compress_with_password(file_to_compress, zip_archive_path, encryption_password)

import subprocess

def compress_and_encrypt_with_7z(file_path, archive_path, password):
    """
    使用 7z 命令行工具压缩并加密文件。
    需要确保系统已安装 7z。
    """
    try:
        command = [
            "7z", "a",
            "-tzip", # 指定压缩格式为 zip
            "-p" + password, # 设置密码
            "-mhe=on", # 加密文件头
            archive_path,
            file_path
        ]
        subprocess.run(command, check=True, capture_output=True, text=True) # check=True 抛出异常，capture_output=True 捕获输出，text=True 使用文本模式
        print(f"文件 {file_path} 成功压缩并加密为 {archive_path}。")
    except subprocess.CalledProcessError as e:
        print(f"7z 命令执行失败：{e.stderr}")
    except FileNotFoundError:
        print("7z 命令未找到。请确保已安装 7-Zip 并将其添加到系统 PATH 环境变量中。")

# 示例
file_to_compress = "example.txt" # 替换为你的文件路径
encrypted_archive_path = "example.7z" # 替换为你想要保存的 7z 文件路径
encryption_password = "MyStrongPassword" # 替换为你想要设置的密码

compress_and_encrypt_with_7z(file_to_compress, encrypted_archive_path, encryption_password)

import gzip

def compress_large_file(input_file, output_file, chunk_size=4096):
    """
    使用 gzip 压缩大型文件，采用流式处理方式。
    """
    try:
        with open(input_file, 'rb') as infile, gzip.open(output_file, 'wb') as outfile:
            while True:
                chunk = infile.read(chunk_size)
                if not chunk:
                    break
                outfile.write(chunk)
        print(f"大型文件 {input_file} 成功压缩为 {output_file}。")
    except Exception as e:
        print(f"压缩过程中发生错误：{e}")


# 示例
large_file_path = "large_file.txt" # 替换为你的大型文件路径
compressed_file_path = "large_file.gz" # 替换为你想要保存的 gzip 文件路径

# 创建一个大型示例文件
with open(large_file_path, "wb") as f:
    f.seek(1024 * 1024 * 100) # 创建一个 100MB 的文件
    f.write(b"\0")

compress_large_file(large_file_path, compressed_file_path)