title: filter file by rows with python
body: <p>I have a file with several columns:</p>
  
  <pre><code>1.000       2.0072      1.000       3.5368      1.000       3.7748
  2.000       2.0890      2.000       3.5867      2.000       3.7302
  3.000       2.0784      3.000       3.3057      3.000       3.6899
  </code></pre>
  
  <p>I need to filter it in such a way that I only select the rows that meet a specific condition for each column, for example just select the rows for which:</p>
  
  <pre><code>C1 &lt; 1
  C2 &gt; 2
  C3 == 3
  </code></pre>
  
  <p>In total there are 5 columns and I need to filter only the rows that meet the three conditions of the example. I had raised something like that but I filtered all the data at the time:</p>
  
  <pre><code>k = open ("test.txt", "r")
  
  lines = k.readlines ()
       for line in lines:
          conv_int = int (lines):
           if lines&gt; 1:
               print (conv_int)
  </code></pre>