Chaining operators like a is b is c
is equivalent to a is b and b is c
.
So the first example is False is False and False is False
, which evaluates to True and True
which evaluates to True
Having parenthesis leads to the result of one evaluation being compared with the next variable (as you say you expect), so (a is b) is c
compares the result of a is b
with c
.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…