title: ImportError: No module named sklearn (Python)
body: <p>I wanna use scikit-learn. I have typed</p>
  
  <pre><code>pip install -U scikit-learn
  pip3 install sklearn
  </code></pre>
  
  <p>to install it; but when i type </p>
  
  <pre><code>$ Python
  &gt;&gt;&gt; import sklearn
  </code></pre>
  
  <p>it returns </p>
  
  <pre><code>ImportError: No module named sklearn
  </code></pre>
  
  <p>I followed other tutorials, but it doesn't work. Furthermore, my enviroment returns this warning:</p>
  
  <blockquote>
    <p>If you have installed scikit-learn from source, please do not forget
    to build the package before using it: run <code>python setup.py install</code> or
    <code>make</code> in the source directory.</p>
  </blockquote>
  
  <p>What is the true code to type in the terminal? I tried to type <code>python setup.py install</code>in the terminal but it doesn't work</p>