title: Get second column of a data frame using pandas
body: <p>I am new to Pandas in Python and I am having some difficulties returning the second column of a dataframe without column names just numbers as indexes.<br></p>
  <pre><code>import pandas as pd
  import os
  
  directory = 'A://'
  sample = 'test.txt'
  
  # Test with Air Sample
  fileAir = os.path.join(directory,sample)
  
  dataAir = pd.read_csv(fileAir,skiprows=3)
  
  print(dataAir.iloc[:,1])
  </code></pre>
  <p>The data I am working with would be similar to:</p>
  <pre><code>data = [[1,2,3],[1,2,3],[1,2,3]]
  </code></pre>
  <p>Then, using pandas I wanted to have only</p>
  <pre><code>[[2,2,2]].
  </code></pre>