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

>>> 0 < 0 == 0
False

This is a chained comparison. It returns true if each pairwise comparison in turn is true. It is the equivalent to (0 < 0) and (0 == 0)

>>> (0) < (0 == 0)
True

This is equivalent to 0 < True which evaluates to True.

>>> (0 < 0) == 0
True

This is equivalent to False == 0 which evaluates to True.

>>> 0 < (0 == 0)
True

Equivalent to 0 < True which, as above, evaluates to True.