How to see if the list contains consecutive numbers

Question

I want to test if a list contains consecutive integers and no repetition of numbers. For example, if I have

l = [1, 3, 5, 2, 4, 6]

It should re

Answer 1

We can use known mathematics formula for checking consecutiveness, Assuming min number always start from 1

sum of consecutive n numbers 1...n = n * (n+1) /2 


  def check_is_consecutive(l):
        maximum = max(l)
        if sum(l) == maximum * (maximum+1) /2 : 
             return True
        return False