Functions with behavior that changes over time def square(x): def f(x): return xx >>square(5) Returns the same >>>f(5) 25 value when called with 25 the same input >>square(5) >>f(5) 25 Return values are 26 >>square(5) different when called >f(5) 25 with the same input 27Functions with behavior that changes over time 6 def square(x): return x * x >>> square(5) 25 >>> square(5) 25 >>> square(5) 25 def f(x): ... >>> f(5) 25 >>> f(5) 26 >>> f(5) 27 Returns the same value when called with the same input Return values are different when called with the same input