Is there an operator to calculate percentage in Python

Question

I ve recently learned that the       sign is used to calculate the remainder of an integer in Python  However I was unable to determine if there s another operator or method to calculate percent in Python   Like with       which will give you the quotient  if you just use a float for one of the integers  it will actually give you the answer like traditional division  So is there a method to work out percentage

User · Accepted Answer

There is no such operator in Python  but it is trivial to implement on your own  In practice in computing  percentages are not nearly as useful as a modulo  so no language that I can think of implements one

User · Answer

use of   def percent expression       if  quot   quot  in expression          expression   expression replace  quot   quot   quot  100 quot       return eval expression    gt  gt  gt  percent  quot 1500 20  quot   300 0  Somthing simple  gt  gt  gt  p   lambda x  x 100  gt  gt  gt  p 20  0 2  gt  gt  gt  100 p 20  20 0  gt  gt  gt

User · Answer

You could just divide your two numbers and multiply by 100  Note that this will throw an error if  quot whole quot  is 0  as asking what percentage of 0 a number is does not make sense  def percentage part  whole     return 100   float part  float whole   Or with a   at the end   def percentage part  whole     Percentage   100   float part  float whole    return str Percentage             Or if the question you wanted it to answer was  quot what is 5  of 20 quot   rather than  quot what percentage is 5 of 20 quot   a different interpretation of the question inspired by Carl Smith s answer   you would write  def percentage percent  whole     return  percent   whole    100 0

User · Answer

Very quickly and sortly-code implementation by using the lambda operator   In  17   percent   lambda part  whole float whole    100   float part  In  18   percent 5 400  Out 18   20 0 In  19   percent 5 435  Out 19   21 75

User · Answer

Brian s answer  a custom function  is the correct and simplest thing to do in general   But if you really wanted to define a numeric type with a  non-standard      operator  like desk calculators do  so that  X   Y  means X   Y   100 0  then from Python 2 6 onwards you can redefine the mod   operator   import numbers  class MyNumberClasswithPct numbers Real       def   mod   self other              Override the builtin   to give X   Y   100 0             return  self   other   100 0       Gotta define the other 21 numeric methods        def   mul   self other           return self   other       which should invoke other   rmul   self             This could be dangerous if you ever use the     operator across a mixture of MyNumberClasswithPct with ordinary integers or floats   What s also tedious about this code is you also have to define all the 21 other methods of an Integral or Real  to avoid the following annoying and obscure TypeError when you instantiate it    Can t instantiate abstract class MyNumberClasswithPct with abstract methods   abs       add      div      eq      float      floordiv      le      lt      mul       neg      pos      pow      radd      rdiv      rfloordiv      rmod      rmul       rpow      rtruediv      truediv      trunc

[python] Is there an operator to calculate percentage in Python?

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