title: Creating new pandas dataframe from certain columns of existing dataframe
body: <p>I have read loaded a csv file into a pandas dataframe and want to do some simple manipulations on the dataframe. I can not figure out how to create a new dataframe based on selected columns from my original dataframe. My attempt:</p>
  
  <pre><code>names = ['A','B','C','D']
  dataset = pandas.read_csv('file.csv', names=names)
  new_dataset = dataset['A','D']
  </code></pre>
  
  <p>I would like to create a new dataframe with the columns A and D from the original dataframe.</p>