python 代码自动补全

今天用 pycharm 运行 demo 的时候发现一个问题，当运行以下代码时，对象f的方法没有提示：

from urllib import request

with request.urlopen('https://api.douban.com/v2/book/2129650') as f:

通过论坛求助知道了以下几种方法：

1. 使用注释辅助推导类型

    from urllib import request, parse
    from http.client import HTTPResponse
    
    with request.urlopen('https://api.douban.com/v2/book/2129650') as f: # type: HTTPResponse
        data = f.read()
        print('Status:', f.status, f.reason)
        for k, v in f.getheaders():
            print('%s: %s' % (k, v))
        print('Data:', data.decode('utf-8'))
   

2. 使用assert isinstance()推导类型

    from urllib import request, parse
    from http.client import HTTPResponse
    
    with request.urlopen('https://api.douban.com/v2/book/2129650') as f: 
        assert isinstance(f, HTTPResponse)
        data = f.read()
        print('Status:', f.status, f.reason)
        for k, v in f.getheaders():
            print('%s: %s' % (k, v))
        print('Data:', data.decode('utf-8'))