>>> 1+1
2
>>> 1.0+1
2.0
>>> 2-4
-2
>>> 2.0-4
-2.0
>>> 2*5
10
>>> 3.0*7
21.0
>>> 2/8
0.25
>>> 2.0/6
0.3333333333333333
>>> 2.0/8
0.25
>>> 6/3
2.0
>>> 6.0/3
2.0
>>> 2//3
0
>>> 3//2
1
>>> 3.0//2
1.0
>>> 3%4
3
>>> 3%4
3
>>> 3.4%4
3.4
>>> 4.3%4
0.2999999999999998
>>> 2**4
16
>>> 3**3
27
>>> 3.0**2
9.0
>>> 3**2.0
9.0
>>> Python基本的加减乘除、乘方、整除、求余
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