title: Unable to install open cv using pip on Python 3.9
body: <pre><code> ERROR: Command errored out with exit status 1: 'e:\python\python.exe' -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '&quot;'&quot;'C:\\Users\\mmusa\\AppData\\Local\\Temp\\pip-install-z5zd5j52\\numpy\\setup.py'&quot;'&quot;'; __file__='&quot;'&quot;'C:\\Users\\mmusa\\AppData\\Local\\Temp\\pip-install-z5zd5j52\\numpy\\setup.py'&quot;'&quot;';f=getattr(tokenize, '&quot;'&quot;'open'&quot;'&quot;', open)(__file__);code=f.read().replace('&quot;'&quot;'\r\n'&quot;'&quot;', '&quot;'&quot;'\n'&quot;'&quot;');f.close();exec(compile(code, __file__, '&quot;'&quot;'exec'&quot;'&quot;'))' install --record 'C:\Users\mmusa\AppData\Local\Temp\pip-record-wre2z2vk\install-record.txt' --single-version-externally-managed --prefix 'C:\Users\mmusa\AppData\Local\Temp\pip-build-env-zf5z8fdj\overlay' --compile --install-headers 'C:\Users\mmusa\AppData\Local\Temp\pip-build-env-zf5z8fdj\overlay\Include\numpy' Check the logs for full command output.
    ----------------------------------------
  ERROR: Command errored out with exit status 1: 'e:\python\python.exe' 'e:\python\lib\site-packages\pip' install --ignore-installed --no-user --prefix 'C:\Users\mmusa\AppData\Local\Temp\pip-build-env-zf5z8fdj\overlay' --no-warn-script-location --no-binary :none: --only-binary :none: -i https://pypi.org/simple -- setuptools wheel scikit-build cmake pip 'numpy==1.11.3; python_version=='&quot;'&quot;'3.5'&quot;'&quot;'' 'numpy==1.13.3; python_version=='&quot;'&quot;'3.6'&quot;'&quot;'' 'numpy==1.14.5; python_version=='&quot;'&quot;'3.7'&quot;'&quot;'' 'numpy==1.17.3; python_version&gt;='&quot;'&quot;'3.8'&quot;'&quot;'' Check the logs for full command output.
  </code></pre>
  <p>I get this error while installing opencv. I have upgraded my pip and I am currently using Python 3.9. Any help would be appreciated</p>