我正在尝试在我的 Raspberry Pi 上安装 laurel，以控制我的智能灯泡。尽管在尝试通过 pip 安装它时出现错误。究竟有什么问题？
查找索引：https://pypi.org/simple, https://www.piwheels.org/simple
Requirement already satisfied: laurel in /usr/local/lib/python2.7/dist-packages/laurel-0.3-py2.7.egg (0.3)
Requirement already satisfied: dimond in /usr/local/lib/python2.7/dist-packages/dimond-0.3-py2.7.egg (from laurel) (0.3)
Exception:
Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/pip/_internal/cli/base_command.py", line 143, in main
status = self.run(options, args)
File "/usr/lib/python2.7/dist-packages/pip/_internal/commands/install.py", line 338, in run
resolver.resolve(requirement_set)
File "/usr/lib/python2.7/dist-packages/pip/_internal/resolve.py", line 102, in resolve
self._resolve_one(requirement_set, req)
File "/usr/lib/python2.7/dist-packages/pip/_internal/resolve.py", line 318, in _resolve_one
add_req(subreq, extras_requested=available_requested)
File "/usr/lib/python2.7/dist-packages/pip/_internal/resolve.py", line 275, in add_req
wheel_cache=self.wheel_cache,
File "/usr/lib/python2.7/dist-packages/pip/_internal/req/constructors.py", line 288, in install_req_from_req
if req.url and comes_from.link.netloc in domains_not_allowed:
AttributeError: 'NoneType' object has no attribute 'netloc'