title: Key error when selecting columns in pandas dataframe after read_csv
body: <p>I'm trying to read in a CSV file into a pandas dataframe and select a column, but keep getting a key error.</p>
  
  <p>The file reads in successfully and I can view the dataframe in an iPython notebook, but when I want to select a column any other than the first one, it throws a key error.</p>
  
  <p>I am using this code:</p>
  
  <pre><code>import pandas as pd
  
  transactions = pd.read_csv('transactions.csv',low_memory=False, delimiter=',', header=0, encoding='ascii')
  transactions['quarter']
  </code></pre>
  
  <p>This is the file I'm working on:
  <a href="https://www.dropbox.com/s/81iwm4f2hsohsq3/transactions.csv?dl=0" rel="noreferrer">https://www.dropbox.com/s/81iwm4f2hsohsq3/transactions.csv?dl=0</a></p>
  
  <p>Thank you! </p>