1.pip安装失败，就要半自动安装
C:\windows\system32>pip install PyInstaller
Collecting PyInstaller
Using cached https://files.pythonhosted.org/packages/e2/c9/0b44b2ea87ba36395483a672fddd07e6a9cb2b8d3c4a28d7ae76c7e7e1e5/PyInstaller-3.5.tar.gz
Installing build dependencies ... done
Getting requirements to build wheel ... done
ERROR: Exception:
Traceback (most recent call last):
File "c:\program files\python36\lib\site-packages\pip\_internal\cli\base_command.py", line 188, in main
status = self.run(options, args)
File "c:\program files\python36\lib\site-packages\pip\_internal\commands\install.py", line 345, in run
resolver.resolve(requirement_set)
File "c:\program files\python36\lib\site-packages\pip\_internal\legacy_resolve.py", line 196, in resolve
self._resolve_one(requirement_set, req)
File "c:\program files\python36\lib\site-packages\pip\_internal\legacy_resolve.py", line