Why does the expression 0 < 0 == 0 return False in Python?

Question

Looking into Queue.py in Python 2.6, I found this construct that I found a bit strange:

def full(self):
    \"\"\"Return True if the queue is full, False oth         


        

Answer 1

As other's mentioned x comparison_operator y comparison_operator z is syntactical sugar for (x comparison_operator y) and (y comparison_operator z) with the bonus that y is only evaluated once.

So your expression 0 < 0 == 0 is really (0 < 0) and (0 == 0), which evaluates to False and True which is just False.