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