title: PyQt5 pip installation error 13. Permission denied
body: <p>I'm trying to install PyQt5 with the command <code>pip install PyQt5</code></p>
  
  <p>but I get an error instead.</p>
  
  <p>I use Python 3.5, windows 10.</p>
  
  <p>error:</p>
  
  <pre><code>C:\WINDOWS\system32&gt;pip install PyQt5
  
  Collecting PyQt5
    Using cached PyQt5-5.7-cp35-none-win_amd64.whl
  Collecting sip (from PyQt5)
    Using cached sip-4.18.1-cp35-none-win_amd64.whl
  Installing collected packages: sip, PyQt5
  Exception:
  Traceback (most recent call last):
    File "c:\anaconda3\lib\site-packages\pip\basecommand.py", line 215, in main
      status = self.run(options, args)
    File "c:\anaconda3\lib\site-packages\pip\commands\install.py", line 317, in run
      prefix=options.prefix_path,
    File "c:\anaconda3\lib\site-packages\pip\req\req_set.py", line 742, in install
      **kwargs
    File "c:\anaconda3\lib\site-packages\pip\req\req_install.py", line 831, in install
      self.move_wheel_files(self.source_dir, root=root, prefix=prefix)
    File "c:\anaconda3\lib\site-packages\pip\req\req_install.py", line 1032, in move_wheel_files
      isolated=self.isolated,
    File "c:\anaconda3\lib\site-packages\pip\wheel.py", line 346, in move_wheel_files
      clobber(source, lib_dir, True)
    File "c:\anaconda3\lib\site-packages\pip\wheel.py", line 324, in clobber
      shutil.copyfile(srcfile, destfile)
    File "c:\anaconda3\lib\shutil.py", line 115, in copyfile
      with open(dst, 'wb') as fdst:
  PermissionError: [Errno 13] Permission denied: 'c:\\anaconda3\\Lib\\site-packages\\sip.pyd'
  </code></pre>