title: "NameError: name 'int64' is not defined"
body: <p>I am relatively new to pandas and while trying to define dtypes to read a large file, I am getting the following error: <code>NameError: name 'int64' is not defined</code>.</p>
  
  <p>I made sure that pandas and numpy are installed and updated, but from what I understand this is a python error. 
  I've gone through a few tutorials where nobody had this problem. See code below returning the error: </p>
  
  <pre class="lang-py prettyprint-override"><code>import pandas as pd
  import numpy as np
  
  data = pd.read_csv("file.csv", encoding="utf-16le", dtype={
      "time": int64,
      "created_date_sk": int64,
      "eventType": object,
      "itemId": int64,
      "fieldId": int64,
      "userId": int64
  })
  
  data.head()
  </code></pre>
  
  <p>Full trace: </p>
  
  <blockquote>
    <p>Traceback (most recent call last):   File "manipulate.py", line 5, in
    module "time": int64, NameError: name 'int64' is not defined</p>
  </blockquote>
  
  <p>I would expect the <code>int64</code> type to be recognized, but it only seems to be able to read the int type. The object type seems to work.</p>