打开网页报错

贾雨村

请问为什么我打开网页就会报错呀？
r=urllib.request.urlopen("https://www.bilibili.com/")
Traceback (most recent call last):
  File "<pyshell#1>", line 1, in <module>
    r=urllib.request.urlopen("https://www.bilibili.com/")
  File "C:\Users\Lenovo\AppData\Local\Programs\Python\Python39\lib\urllib\request.py", line 214, in urlopen
    return opener.open(url, data, timeout)
  File "C:\Users\Lenovo\AppData\Local\Programs\Python\Python39\lib\urllib\request.py", line 523, in open
    response = meth(req, response)
  File "C:\Users\Lenovo\AppData\Local\Programs\Python\Python39\lib\urllib\request.py", line 632, in http_response
    response = self.parent.error(
  File "C:\Users\Lenovo\AppData\Local\Programs\Python\Python39\lib\urllib\request.py", line 555, in error
    result = self._call_chain(*args)
  File "C:\Users\Lenovo\AppData\Local\Programs\Python\Python39\lib\urllib\request.py", line 494, in _call_chain
    result = func(*args)
  File "C:\Users\Lenovo\AppData\Local\Programs\Python\Python39\lib\urllib\request.py", line 747, in http_error_302
    return self.parent.open(new, timeout=req.timeout)
  File "C:\Users\Lenovo\AppData\Local\Programs\Python\Python39\lib\urllib\request.py", line 523, in open
    response = meth(req, response)
  File "C:\Users\Lenovo\AppData\Local\Programs\Python\Python39\lib\urllib\request.py", line 632, in http_response
    response = self.parent.error(
  File "C:\Users\Lenovo\AppData\Local\Programs\Python\Python39\lib\urllib\request.py", line 561, in error
    return self._call_chain(*args)
  File "C:\Users\Lenovo\AppData\Local\Programs\Python\Python39\lib\urllib\request.py", line 494, in _call_chain
    result = func(*args)
  File "C:\Users\Lenovo\AppData\Local\Programs\Python\Python39\lib\urllib\request.py", line 641, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 403: Forbidden

1q23w31

未设置请求头，被反爬