Why in Python does “0, 0 == (0, 0)” equal “(0, False)”?

Question

In Python (I checked only with Python 3.6 but I believe it should hold for many of the previous versions as well):

(0, 0) == 0, 0   # results in a two elemen         


        

Answer 1

Adding a couple of parentheses around the order in which actions are performed might help you understand the results better:

# Build two element tuple comprising of 
# (0, 0) == 0 result and 0
>>> ((0, 0) == 0), 0
(False, 0)

# Build two element tuple comprising of
# 0 and result of (0, 0) == 0 
>>> 0, (0 == (0, 0))
(0, False)

# Create two tuples with elements (0, 0) 
# and compare them
>>> (0, 0) == (0, 0) 
True

The comma is used to to separate expressions (using parentheses we can force different behavior, of course). When viewing the snippets you listed, the comma , will separate it and define what expressions will get evaluated:

(0, 0) == 0 ,   0
#-----------|------
  expr 1      expr2

The tuple (0, 0) can also be broken down in a similar way. The comma separates two expressions comprising of the literals 0.