Robobrowser BeautifulSoup错误

Question

我正在做webscraper登录到一个网站，当我登录我收到beautifulSoup错误，我不知道如何解决，以及对象错误，我也感到困惑。我一直在看网页教程刮了一会儿，真正需要帮助的

from robobrowser import RoboBrowser 
browser = RoboBrowser() 
login_url = 'http://netacad.com/login' 
browser.open(login_url) 
form = browser.get_form(id='f') 
form['username'].value = "username" 
form['password'].value = "password" 
browser.submit_form(form) 

错误

The code that caused this warning is on line 10 of the file C:\Program Files (x86)\Wing IDE 101 6.0\bin\wingdb.py. To get rid of this warning, change code that looks like this: 

BeautifulSoup(YOUR_MARKUP}) 

to this: 

BeautifulSoup(YOUR_MARKUP, "html.parser") 

    markup_type=markup_type)) 
Traceback (most recent call last): 
    File "C:/Users/Leon/Desktop/retrieve.py", line 6, in <module> 
    form['username'].value = "username" 
builtins.TypeError: 'NoneType' object is not subscriptable 

Answer 1

试试：

browser = RoboBrowser(parser='html.parser')