title: Concat 2 columns in pandas - AttributeError: 'DataFrame' object has no attribute 'concat'
body: <p>I am trying to concat along 2 columns in pandas. The code :</p>
  
  <pre><code>import pandas as pd
  import numpy as np
  from statsmodels import api as sm
  import pandas_datareader.data as web
  import datetime
  
  start = datetime.datetime(2015,2,12)
  end = datetime.datetime.today()
  df = web.get_data_yahoo(['F', '^GSPC'], start, end)
  
  df1 = df.concat(columns=[F['Close'], gspc['Close']], axis=1)
  </code></pre>
  
  <p>But i am getting the following error:</p>
  
  <pre><code>AttributeError: 'DataFrame' object has no attribute 'concat'
  </code></pre>