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数字 除法运算 (/) 返回float类型 >>> 8 / 5 1.6 >>> 8 // 5 1 >>> 7 / 5 1.4 >>> 7 // 5 1 >>> 8 % 5 3 ** 运算符计算乘方 >>> 5 ** 2 25 >>> 2 ** 7 128 =赋值 >>> width = 20 >>> height = 5 *

if >>> x = int(input("Please enter an integer:")) Please enter an integer:42 >>> if x < 0: ... x = 0 ... print("Negative changed to zero") ... elif x == 0: ... print('Zero') ... elif x == 1: ... print('Single') ... else