title: Cannot download and install scikit-learn
body: <p>I am pretty new to python. I want to use KMean code, and I want to install <code>scikit-learn</code> or <code>sklearn</code>. </p>
  
  <p>I used this code to attempt install these packages:</p>
  
  <pre><code>pip install -U sklearn
  pip install -U scikit-learn
  </code></pre>
  
  <p>But I got this error:</p>
  
  <pre><code>Command /usr/bin/python -c "import setuptools, tokenize;__file__='/tmp/pip_build_reihaneh/sklearn/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-89YQB7-record/install-record.txt --single-version-externally-managed --compile failed with error code 1 in /tmp/pip_build_reihaneh/sklearn
  Storing debug log for failure in /home/reihaneh/.pip/pip.log
  </code></pre>
  
  <p>What is the  cause of the problem? </p>