从零开始用Python解析命令行参数之标准库argparse和第三方库click

# cli_argparse.py
import argparse

def main():
    parser = argparse.ArgumentParser(description="处理文本文件")
    parser.add_argument("filename", help="输入文件路径")
    parser.add_argument("-o", "--output", help="输出文件路径")
    parser.add_argument("--uppercase", action="store_true", help="转换为大写")

    args = parser.parse_args()

    with open(args.filename, 'r') as f:
        content = f.read()
    
    if args.uppercase:
        content = content.upper()
    
    output_file = args.output or "output.txt"
    with open(output_file, 'w') as f:
        f.write(content)
    
    print(f"✅ 已处理 {args.filename} → {output_file}")

if __name__ == "__main__":
    main()

python cli_argparse.py input.txt -o result.txt --uppercase

pip install click

# cli_click.py
import click

@click.command()
@click.argument('filename')
@click.option('-o', '--output', default='output.txt', help='输出文件路径')
@click.option('--uppercase', is_flag=True, help='转换为大写')
def process_file(filename, output, uppercase):
    """处理文本文件"""
    with open(filename, 'r') as f:
        content = f.read()
    
    if uppercase:
        content = content.upper()
    
    with open(output, 'w') as f:
        f.write(content)
    
    click.echo(f"✅ 已处理 {filename} → {output}")

if __name__ == "__main__":
    process_file()

python cli_click.py input.txt -o result.txt --uppercase

@click.group()
def cli():
    pass

@cli.command()
def init():
    click.echo("初始化项目")

@cli.command()
def deploy():
    click.echo("部署应用")

# 使用: python app.py init

@click.option('--count', type=int, default=1)
@click.option('--verbose', type=bool)

click.secho("成功！", fg='green')
with click.progressbar(range(100)) as bar:
    for i in bar:
        time.sleep(0.01)