# sign in aiohttp后如何获取参数

import aiohttp
import re

async def get_parameter(session, url, parameter_name):
    async with session.get(url) as response:
        response_text = await response.text()
        parameter_value = re.search(f'{parameter_name}=(.*?)&', response_text)
        if parameter_value:
            return parameter_value.group(1)
        else:
            return None

async def main():
    async with aiohttp.ClientSession() as session:
        login_url = 'https://example.com/login'
        username = 'your_username'
        password = 'your_password'

        # Perform login
        login_data = {
            'username': username,
            'password': password
        }
        await session.post(login_url, data=login_data)

        # Get parameter
        parameter_name = 'example_parameter'
        parameter_url = 'https://example.com/protected_page'
        parameter_value = await get_parameter(session, parameter_url, parameter_name)

        if parameter_value:
            print(f'The value of {parameter_name} is: {parameter_value}')
        else:
            print(f'Failed to get the value of {parameter_name}')

# Run the main function
asyncio.run(main())