python - count number of ones in a given integer -

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How do you calculate the number of people in the binary representation of the given integer.

Say you have given a number, 20 , which is in binary, 10100 , so many people have 2 numbers.

Use the awesome module. 

  & gt; & Gt; & Gt; Counter import from & gt; & Gt; & Gt; Binary = Bin (20) [2:]> gt; & Gt; & Gt; Counter (binary) counter ({'0': 3, '1': 2})   
 Or you can use the built-in function  count ()  :  
  & gt; & Gt; & Gt; Binary = Bin (20) [2:]> gt; & Gt; & Gt; BinaryCount ('1') 2   
 Or even:  
  & gt; & Gt; & Gt; (Amount for bin (20) in (I): If I == '1' 2)   
 But this final solution is slower than  count (< / Code>

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