title: matplotlib.pyplot does not work in my anaconda environment
body: <p>I am using Windows 10, and I'm on an anaconda environment with python 3.6. Matplotlib.pyplot doesn't work for some reason. Once I write <code>plt.show()</code>, the program stalls. Matplotlib is installed and updated in my anaconda environment. </p>
  
  <p>For instance, this program didn't work when I wrote this:</p>
  
  <pre><code>import numpy as np
  import matplotlib
  import matplotlib.pyplot as plt
  
  t = np.arange(0, 10, 1)
  x = t ** 2
  plt.plot(t, x)
  plt.show()
  </code></pre>
  
  <p>Furthermore, matplotlib.pyplot does in fact work outside anaconda. Any ideas?</p>