Python: print "word" in [] == False

Question

Going a bit mental here trying to work out what this does in python:

print "word" in [] == False

Why does this print False?

Answer 1

Perhaps a more clear example of this unusual behaviour is the following:

>>> print 'word' in ['word']
True
>>> print 'word' in ['word'] == True
False

---

Your example is equivalent to:

print ("word" in []) and ([] == False)

This is because two boolean expressions can be combined, with the intention of allowing this abbreviation:

a < x < b

for this longer but equivalent expression:

(a < x) and (x < b)

Answer 2

Just like you can chain operators in 23 < x < 42, you can do that with in and ==.

"word" in [] is False and [] == False evaluates to False. Therefore, the whole result is

"word" in [] == False
"word" in [] and [] == False
False and False
False