title: 'module' object is not callable error in jupyter notebook
body: <p>Initially, I was getting "list object is not callable" error but after "importing list " new error came in the picture as shown below.</p>
  
  <pre><code>import pandas as pd
  import numpy as np
  import matplotlib.pyplot as plt
  imort list
  data_cols=['user id','movie id','rating','timestamp']
  item_cols=['movie id','movie title','release date','video release date','IMDb URL','unknown','Action','Adventure','Animation','Childrens','Comedy','Crime','Documentary','Drama','Fantasy','Film-Noir','Horror','Musical','Mystery','Romance ','Sci-Fi','Thriller','War' ,'Western']
  user_cols = ['user id','age','gender','occupation','zip code']
  #importing the data files onto dataframes
  users=pd.read_csv('u.user',sep='|',names=user_cols,encoding='latin-1')
  item=pd.read_csv('u.item',sep='|',names=item_cols,encoding='latin-1')
  data=pd.read_csv('u.data',sep='\t',names=data_cols,encoding='latin-1')
  dataset=pd.merge(pd.merge(item,data),users)
  #print(dataset.head())
  rating_total=dataset.groupby('movie title').size()
  rating_mean=(dataset.groupby('movie title'))['movie title','rating']
  rating_mean=rating_mean.mean()
  rating_total=pd.DataFrame({'movie title':rating_total.index,'total 
  ratings':rating_total.values})
  rating_mean['movie title']=rating_mean.index
  final=pd.merge(rating_mean,rating_total).sort_values(by='total 
  ratings',ascending=False)
  pop=final[:300].sort_values(by='rating',ascending=False)
  pop=pop['movie title']
  pop1=list(pop.head(10))
  </code></pre>
  
  <p><strong>Output</strong></p>
  
  <pre><code>TypeError                                 Traceback (most recent call last)
  &lt;ipython-input-57-0b36af3a9876&gt; in &lt;module&gt;
       30 pop=pop['movie title']
       31 #print(pop.head())
  ---&gt; 32 pop1=list(pop.head(10))
  
  TypeError: 'module' object is not callable
  </code></pre>