Operadores ternarios en Python

Aprendiendo Python una de las primeras cosas interesantes con las que me encontré es con operadores que toman 3 parámetros. Veamos (en inglés) un extracto de un tutorial en PDF:

The basic form of the operator is 

expression if condition else expression 

Python evaluates the condition – in the middle – first. If the condition is True, then the left-hand expression is evaluated, and that’s the value of the operation. If the condition is False, then the right-hand expression is evaluated, and that’s the value of the operation. Note that the condition is always evaluated. Only one of the other two expressions is evaluated, making this a kind of short-cut operator like and and or.

Here are a couple of examples.

average = sum/count if count != 0 else None

oddSum = oddSum + ( n if n % 2 == 1 else 0 )

The intent is to have an English-like reading of the statement. “The average is the sum divided by the count if the count is non-zero; else the average is None”.

Es una construcción algo rara pero simpática.