title: How should I install the packages with pip?
body: <p>I installed python anaconda on my computer Windows10 and created new environment in it. Then, I tried to install the package "scikit-learn" with pip on cmd in it, but this error below was returned. Why cannot I install and how should I do?</p>
  
  <pre><code>
  C:\Users\nima&gt;pip install scikit-learn==0.19.1
  Collecting scikit-learn==0.19.1
    Using cached https://files.pythonhosted.org/packages/f5/2c/5edf2488897cad4fb8c4ace86369833552615bf264460ae4ef6e1f258982/scikit-learn-0.19.1.tar.gz
  Building wheels for collected packages: scikit-learn
    Building wheel for scikit-learn (setup.py) ... error
    ERROR: Command errored out with exit status 1:
     command: 'C:\Users\nima\Anaconda3\envs\aidemy\python.exe' -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\Users\\nima\\AppData\\Local\\Temp\\pip-install-jijyje_y\\scikit-learn\\setup.py'"'"'; __file__='"'"'C:\\Users\\nima\\AppData\\Local\\Temp\\pip-install-jijyje_y\\scikit-learn\\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' bdist_wheel -d 'C:\Users\nima\AppData\Local\Temp\pip-wheel-3o9s77c6' --python-tag cp37
         cwd: C:\Users\nima\AppData\Local\Temp\pip-install-jijyje_y\scikit-learn\
    Complete output (735 lines):
    Partial import of sklearn during the build process.
    blas_opt_info:
    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/nima/Anaconda3/envs/aidemy\\Library\\lib']
      NOT AVAILABLE
  
    blis_info:
    No module named 'numpy.distutils._msvccompiler' in numpy.distutils; trying from distutils
    customize MSVCCompiler
      libraries blis not found in ['C:\\Users\\nima\\Anaconda3\\envs\\aidemy\\lib', 'C:\\', 'C:\\Users\\nima\\Anaconda3\\envs\\aidemy\\libs', 'C:\\Users\\nima\\Anaconda3\\Library\\lib']
      NOT AVAILABLE
  
    openblas_info:
    No module named 'numpy.distutils._msvccompiler' in numpy.distutils; trying from distutils
    customize MSVCCompiler
    No module named 'numpy.distutils._msvccompiler' in numpy.distutils; trying from distutils
    customize MSVCCompiler
      libraries openblas not found in ['C:\\Users\\nima\\Anaconda3\\envs\\aidemy\\lib', 'C:\\', 'C:\\Users\\nima\\Anaconda3\\envs\\aidemy\\libs', 'C:\\Users\\nima\\Anaconda3\\Library\\lib']
    get_default_fcompiler: matching types: '['gnu', 'intelv', 'absoft', 'compaqv', 'intelev', 'gnu95', 'g95', 'intelvem', 'intelem', 'flang']'
    customize GnuFCompiler
    Could not locate executable g77
  
    ...
  
    customize PGroupFlangCompiler
    Could not locate executable flang
    don't know how to compile Fortran code on platform 'nt'
      NOT AVAILABLE
  
    atlas_3_10_blas_threads_info:
    Setting PTATLAS=ATLAS
    No module named 'numpy.distutils._msvccompiler' in numpy.distutils; trying from distutils
    customize MSVCCompiler
      libraries tatlas not found in ['C:\\Users\\nima\\Anaconda3\\envs\\aidemy\\lib', 'C:\\', 'C:\\Users\\nima\\Anaconda3\\envs\\aidemy\\libs', 'C:\\Users\\nima\\Anaconda3\\Library\\lib']
      NOT AVAILABLE
  
  
  ...
  
  </code></pre>