title: failed to import numpy as np when I worked with jupyter notebook
body: <p>In Jupyter, there is an <code>ImportError</code>:</p>
  
  
  
  <pre><code>import numpy as np 
  </code></pre>
  
  <blockquote>
    <p>ImportError                                 Traceback (most recent call last)</p>
    
    <p>ipython-input-1-4ee716103900 in module()</p>
    
    <p>----> 1 import numpy as np</p>
    
    <p>ImportError: No mudule named numpy</p>
  </blockquote>
  
  <p>But in Python, there is no error:</p>
  
  
  
  <pre><code>import numpy as np 
  </code></pre>