Math Algorithm

x = 5

y = 8

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x+=2

#result is 7, x= x+2

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y-=2

#result is 6, y= y-2

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y % x

#result is 3

# % means reminder 求余数

5%3 == 2

另用数字反转

876%10 == 6

876%100 == 76

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y // x

#result is 1

# % means quotients 求商数 (商数：y里面有几个x)

5//3 == 2

另用数字选取

876//10 == 87

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3*1**3

>>>3 # **（求平方） 优先于 *（求乘）

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NOT、AND、OR # NOT 优于 AND 优于 OR