title: How to solve "Preparing wheel metadata ... error" this error for MacOS for python 3.9
body: <p>I am trying to use pip3 with python 3.9 to install modules... I read replies for windows which suggest installing VisualStudio as we need a good C++ compiler</p>
  <p>I use macOS</p>
  <p>I am adding the input and error message for better understanding</p>
  <p>Input:</p>
  <pre><code>rohansaswade@Rohans-MBP ~ % pip3 install numpy
  </code></pre>
  <p>Output:</p>
  <pre><code> 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
      ERROR: Command errored out with exit status 1:
  </code></pre>
  <p>I did not mention the complete error output as it seems pretty irrelevant, yet if you need it to help me, please drop a comment.</p>
  <p>I use macOS Catalina 10.15.7 and python 3.9</p>