python命令行工具Click快速掌握

pip install Click

import click
@click.command()
def hello():
  click.echo('Hello World!')
if __name__ == '__main__':
  hello()

python click_demo.py
Hello World!

import click

@click.command()
@click.option("--count", default=1, help="打印次数", type=int)
def hello(count):
  """
  这是一个简单示例
  """
  for i in range(count):
    click.echo('Hello World!')

if __name__ == '__main__':
  hello()

$ python click_demo.py --help

Usage: click_demo.py [OPTIONS]

 这是一个简单示例

Options:
 --count INTEGER 打印次数
 --help    Show this message and exit.

>python click_demo.py --count 3

Hello World!
Hello World!
Hello World!

import click

@click.command()
@click.option("--count", default=1, help="打印次数", type=int)
@click.option("--name", prompt="请输入名字", help="姓名")
def hello(count, name):
  """
  这是一个简单示例
  """
  for i in range(count):
    click.echo(f'Hello {name}!')

if __name__ == '__main__':
  hello()

$ python click_demo.py

请输入名字: lzjun
Hello lzjun!

# db.py
import click

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

@click.command()
@click.option("--name", help="用户名")
def add(name):
  """
  添加用户
  :param name:
  :return:
  """
  click.echo(f'add user {name}')

@click.command()
@click.option("--id", help="用户名")
def delete(id):
  """
  删除用户
  :param id:
  :return:
  """
  click.echo(f'delete user {id}')

db.add_command(delete)
db.add_command(add)

if __name__ == '__main__':
  db()

python db.py --help
Usage: db.py [OPTIONS] COMMAND [ARGS]...

Options:
 --help Show this message and exit.

Commands:
 add   添加用户 :param name: :return:
 delete 删除用户 :param id: :return:

$ flask
Usage: flask [OPTIONS] COMMAND [ARGS]...

 A general utility script for Flask applications.

 Provides commands from Flask, extensions, and the application. Loads the
 application defined in the FLASK_APP environment variable, or from a
 wsgi.py file. Setting the FLASK_ENV environment variable to 'development'
 will enable debug mode.

  $ export FLASK_APP=hello.py
  $ export FLASK_ENV=development
  $ flask run

Options:
 --version Show the flask version
 --help   Show this message and exit.

Commands:
 add_user      添加账号 :param name: :param username: :param password:...
 init_invite_code  添加邀请码
 recommend_account 更新推荐账号
 routes       Show the routes for the app.
 run        Runs a development server.
 shell       Runs a shell in the app context.