title: Python Count The Different Values From Two Columns
body: <p>If i have a dataframe:</p>
  
  <pre><code>A                         B         C
  0.0285714285714285        4         0.11428571
  0.107142857142857         4         0.42857143
  0.007142857142857         6         0.04285714
  1.2                       4         5.5
  1.5                       3         3
  </code></pre>
  
  <p>Desired output is;</p>
  
  <pre><code>A*B                    C                       Difference            
  0.114285714285714‬      0.11428571          0.000000004285714‬            
  0.428571428571428‬      0.42857143         -0.000000001428572‬
  0.042857142857142‬      0.04285714          0.000000002857142‬
  4.8                    5.5                        -0.7
  4.5                    3                           1.5
  
  Count: 2
  </code></pre>
  
  <p>I want to ignore the like 3 rows, because the difference is very small. only the first digit after the comma should be included.</p>
  
  <p>Could you please help me about this?</p>