title: 'wordcloud' is not defined python3.6
body: <p>I am trying to make a wordcloud on movie genre in this link but I have some error,  <code>name 'wordcloud' is not defined</code> even if the package
  <code>wordcloud</code> is installed. </p>
  
  <p>Could anybody help me please, the version of python is 3.6.3.</p>
  
  <pre><code>import numpy as np # linear algebra
  import pandas as pd # data processing, CSV file I/O (e.g. pd.read_csv)
  import matplotlib.pyplot as plt
  import seaborn as sns
  from wordcloud import WordCloud 
  
  # explorer les pandas series 
  movies=pd.read_csv ('bit.ly/imdbratings') 
  
  data=movies.genre.value_counts()
  print(data)
  
  plt.figure(figsize=(20,10))
  wordcloud=wordcloud(background_color='white',mode="RGB", width=2000 , height=1000).generate(data)
  plt.title("test")
  plt.imshow(wordcloud)
  plt.axis("off")
  plt.show()
  </code></pre>