管理员运行且确保完全控制仍然报错：Exception:
Traceback (most recent call last):
File "c:\program files (x86)\python35-32\lib\shutil.py", line 387, in _rmtree_unsafe
os.unlink(fullname)
PermissionError: [WinError 5] 拒绝访问。: 'C:\\Users\\Lenovo\\AppData\\Local\\Temp\\pip-vb5yo8nm-uninstall\\program files (x86)\\python35-32\\scripts\\pip.exe'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "c:\program files (x86)\python35-32\lib\site-packages\pip\basecommand.py", line 215, in main
File "c:\program files (x86)\python35-32\lib\site-packages\pip\commands\install.py", line 342, in run
File "c:\program files (x86)\python35-32\lib\site-packages\pip\req\req_set.py", line 795, in install
File "c:\program files (x86)\python35-32\lib\site-packages\pip\req\req_install.py", line 767, in commit_uninstall
File "c:\program files (x86)\python35-32\lib\site-packages\pip\req\req_uninstall.py", line 142, in commit
File "c:\program files (x86)\python35-32\lib\site-packages\pip\_vendor\retrying.py", line 49, in wrapped_f
return Retrying(*dargs, **dkw).call(f, *args, **kw)
File "c:\program files (x86)\python35-32\lib\site-packages\pip\_vendor\retrying.py", line 212, in call
raise attempt.get()
File "c:\program files (x86)\python35-32\lib\site-packages\pip\_vendor\retrying.py", line 247, in get
six.reraise(self.value[0], self.value[1], self.value[2])
File "c:\program files (x86)\python35-32\lib\site-packages\pip\_vendor\six.py", line 686, in reraise
def assertRegex(self, *args, **kwargs):
File "c:\program files (x86)\python35-32\lib\site-packages\pip\_vendor\retrying.py", line 200, in call
attempt = Attempt(fn(*args, **kwargs), attempt_number, False)
File "c:\program files (x86)\python35-32\lib\site-packages\pip\utils\__init__.py", line 102, in rmtree
File "c:\program files (x86)\python35-32\lib\shutil.py", line 494, in rmtree
return _rmtree_unsafe(path, onerror)
File "c:\program files (x86)\python35-32\lib\shutil.py", line 384, in _rmtree_unsafe
_rmtree_unsafe(fullname, onerror)
File "c:\program files (x86)\python35-32\lib\shutil.py", line 384, in _rmtree_unsafe
_rmtree_unsafe(fullname, onerror)
File "c:\program files (x86)\python35-32\lib\shutil.py", line 384, in _rmtree_unsafe
_rmtree_unsafe(fullname, onerror)
File "c:\program files (x86)\python35-32\lib\shutil.py", line 389, in _rmtree_unsafe
onerror(os.unlink, fullname, sys.exc_info())
File "c:\program files (x86)\python35-32\lib\site-packages\pip\utils\__init__.py", line 114, in rmtree_errorhandler
PermissionError: [WinError 5] 拒绝访问。: 'C:\\Users\\Lenovo\\AppData\\Local\\Temp\\pip-vb5yo8nm-uninstall\\program files (x86)\\python35-32\\scripts\\pip.exe'
当遇到`WinError5`拒绝访问错误时，不要尝试修改每个文件权限。问题在于需要管理员权限运行。在pip命令后加上`--user`选项即可正常下载安装包，避免权限冲突。
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