title: How to fix "ERROR: Command errored out with exit status 1" when using pip to install numpy in Python 3.8.0
body: <p>After upgrading Python to 3.8.0, I have trouble installing packages related to numpy using pip, including numpy, matplotlib and sklearn.
  The error message is as follows:</p>
  
  <p>What should I do to solve this problem?</p>
  
  <pre class="lang-sh prettyprint-override"><code>C:\WINDOWS\System32&gt;pip install numpy
  
  ...
  
  Installing collected packages: numpy
      Running setup.py install for numpy ... error
      ERROR: Command errored out with exit status 1:                                                                           command: 'c:\users\tonakai\appdata\local\programs\python\python38\python.exe' -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\Users\\Tonakai\\AppData\\Local\\Temp\\pip-install-ub45_c1a\\numpy\\setup.py'"'"'; __file__='"'"'C:\\Users\\Tonakai\\AppData\\Local\\Temp\\pip-install-ub45_c1a\\numpy\\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record 'C:\Users\Tonakai\AppData\Local\Temp\pip-record-3pg_3uvq\install-record.txt' --single-version-externally-managed --compile
           cwd: C:\Users\Tonakai\AppData\Local\Temp\pip-install-ub45_c1a\numpy\
      Complete output (299 lines):
      Running from numpy source directory.
  
      Note: if you need reliable uninstall behavior, then install
      with pip instead of using `setup.py install`:
  
        - `pip install .`       (from a git repo or downloaded source
                                 release)
        - `pip install numpy`   (last NumPy release on PyPi)
  
    blas_mkl_info:
    No module named 'numpy.distutils._msvccompiler' in numpy.distutils; trying from distutils
    customize MSVCCompiler
      libraries mkl_rt not found in ['c:\\users\\tonakai\\appdata\\local\\programs\\python\\python38\\lib', 'C:\\', 'c:\\users\\tonakai\\appdata\\local\\programs\\python\\python38\\libs']
      NOT AVAILABLE
  ...
  
  c:\users\tonakai\appdata\local\programs\python\python38\lib\distutils\dist.py:274: UserWarning: Unknown distribution option: 'define_macros'
        warnings.warn(msg)
      non-existing path in 'numpy\\random': 'src\\splitmix64\\splitmix.h'
      running install
      running build
      running config_cc
      unifing config_cc, config, build_clib, build_ext, build commands --compiler options
      running config_fc
      unifing config_fc, config, build_clib, build_ext, build commands --fcompiler options
      running build_src
      build_src
      building py_modules sources
      building library "npymath" sources
      No module named 'numpy.distutils._msvccompiler' in numpy.distutils; trying from distutils
      error: Microsoft Visual C++ 14.0 is required. Get it with "Microsoft Visual C++ Build Tools": https://visualstudio.microsoft.com/downloads/
      ----------------------------------------
  ERROR: Command errored out with exit status 1: 'c:\users\tonakai\appdata\local\programs\python\python38\python.exe' -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\Users\\Tonakai\\AppData\\Local\\Temp\\pip-install-ub45_c1a\\numpy\\setup.py'"'"'; __file__='"'"'C:\\Users\\Tonakai\\AppData\\Local\\Temp\\pip-install-ub45_c1a\\numpy\\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record 'C:\Users\Tonakai\AppData\Local\Temp\pip-record-3pg_3uvq\install-record.txt' --single-version-externally-managed --compile Check the logs for full command output.
  </code></pre>