我很难理解.pic和.pic img之间的区别。它们在我的代码中的行为有所不同：
<div class="picture">
<img src="picture.jpg" />
</div>
答案 0 :(得分：1)
Traceback (most recent call last):
File “/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/core/handlers/exception.py”, line 41, in inner
response = get_response(request)
File “/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/core/handlers/base.py”, line 249, in _legacy_get_response
response = self._get_response(request)
File “/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/core/handlers/base.py”, line 187, in _get_response
response = self.process_exception_by_middleware(e, request)
File “/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/core/handlers/base.py”, line 185, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File “/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/utils/decorators.py”, line 185, in inner
return func(*args, **kwargs)
File “/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/views/decorators/csrf.py”, line 58, in wrapped_view
return view_func(*args, **kwargs)
File “/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/views/generic/base.py”, line 68, in view
return self.dispatch(request, *args, **kwargs)
File “/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/rest_framework/views.py”, line 489, in dispatch
response = self.handle_exception(exc)
File “/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/rest_framework/views.py”, line 477, in dispatch
self.initial(request, *args, **kwargs)
File “/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/rest_framework/views.py”, line 394, in initial
self.perform_authentication(request)
File “/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/rest_framework/views.py”, line 320, in perform_authentication
request.user
File “/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/rest_framework/request.py”, line 378, in getattribute
return super(Request, self).getattribute(attr)
File “/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/rest_framework/request.py”, line 196, in user
self._authenticate()
File “/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/rest_framework/request.py”, line 342, in _authenticate
user_auth_tuple = authenticator.authenticate(self)
File “/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/edx_rest_framework_extensions/auth/jwt/authentication.py”, line 47, in authenticate
return super(JwtAuthentication, self).authenticate(request)
File “/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/rest_framework_jwt/authentication.py”, line 33, in authenticate
payload = jwt_decode_handler(jwt_value)
File “/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/edx_rest_framework_extensions/auth/jwt/decoder.py”, line 57, in jwt_decode_handler
_verify_jwt_signature(token, jwt_issuer)
File “/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/edx_rest_framework_extensions/auth/jwt/decoder.py”, line 137, in _verify_jwt_signature
key_set = _get_signing_jwk_key_set(jwt_issuer)
File “/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/edx_rest_framework_extensions/auth/jwt/decoder.py”, line 189, in _get_signing_jwk_key_set
key_set.load_jwks(signing_jwk_set)
File “/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/jwkest/jwk.py”, line 776, in load_jwks
self.load_dict(json.loads(jwks))
File “/usr/lib/python2.7/json/init.py”, line 339, in loads
return _default_decoder.decode(s)
File “/usr/lib/python2.7/json/decoder.py”, line 364, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File “/usr/lib/python2.7/json/decoder.py”, line 382, in raw_decode
raise ValueError(“No JSON object could be decoded”)
在名为.picture img的{{1}}中选择img子级，而div仅抓取名为.picture的{{1}}