title: Panda Dataframe: Check if row satisfies multiple column filters
body: <p>Is there any way to check if certain rows in the dataframe satisfy multiple filters? I would like to find rows that satisfy filters and add extra values if they pass the filters.</p>
  
  <p>For example, </p>
  
  <pre><code>a b c d e f
  2000-01-01 1 1 2  
  2000-01-02 0 0 0  
  2000-01-03 1 -2 -1  
  2000-01-04 5 -5 -2  
  2000-01-05 0 -5 0  
  2000-01-06 0 0 0  
  2000-01-07 5 -2 6  
  2000-01-08 0 0 0  
  </code></pre>
  
  <p>Consider the dataframe with columns a, b, c, d, e, f (d,e,f are empty). How can I do something like:</p>
  
  <pre><code>if (df['a'] == 0 AND df['b'] == 0 AND df['c'] == 0):
    df['d'] = 0
    df['e'] = 0
    df['f'] = 0
  </code></pre>
  
  <p>So row 2, 6, and 8 should have 0s in columns d, e, f, and the rest of the rows should have empty values in those columns</p>
  
  <p>Thanks!</p>