title: Failed to install numpy in python version 3.9
body: <p>I'm a beginner in python.
  When I want to install NumPy, I didn't work, and especially when the execution reaches this line &quot;Preparing wheel metadata&quot; and here is the error:</p>
  <pre><code>C:\Users\dell&gt;pip install numpy
  Defaulting to user installation because normal site-packages is not writeable
  Collecting numpy
    Using cached numpy-1.19.2.zip (7.3 MB)
    Installing build dependencies ... done
    Getting requirements to build wheel ... done
      Preparing wheel metadata ... error
  </code></pre>
  <pre><code>ERROR: Command errored out with exit status 1: 'c:\program files\python39\python.exe' 'c:\program files\python39\lib\site-packages\pip\_vendor\pep517\_in_process.py' prepare_metadata_for_build_wheel 'C:\Users\dell\AppData\Local\Temp\tmphnzlje19' Check the logs for full command output.
  
  </code></pre>