how to write a function to make operation as a argument in the function

[luofeiyu]

I want to write a function to make operation as a argument in the function.

|def   fun(op,x,y):
     return(x op y)|

it is my target for the funciton:

if op ="+" fun(op,3,9) =12
if op ="*" fun(op,3,9) =27

How to write it?

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