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Multipel assignment (3)
Equality is commutative and assignment is not
mathematics: if a = 7, then 7 = a
Python:
a = 7is possible,7 = ais not possible (think of 7 <- a)
Equality is always true, assignment can change
mathematics: if a is equal to b, then b is always equal to a
Python: the value of a can change without the value of b being changed
a = 5 b = a # a is assigned to b (a and b are equal) a = 3 # 3 is assigned to a (a and b are no longer equal)