Python 3 數值計算

Python 3.4.3 (v3.4.3:9b73f1c3e601, Feb 24 2015, 22:43:06) [MSC v.1600 32 bit (Intel)] on win32
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>>> 17 /3 #典型的除法返回一個浮點數
5.666666666666667
>>> 17 // 3 #除法求整
5
>>> 17 % 3 #除法求餘
2
>>> 5*3+2 #四則運算
17
>>> 5**2 #平方運算
25
>>> 2**7 #2^7運算
128
>>> width = 20
>>> height = 5 * 9
>>> width * height
900
>>> 3 * 3.75 /1.5 #全浮點運算
7.5
>>> tax = 12.5/100
>>> price = 100.50
>>> price * tax # "_"表明着上一次計算的數據
12.5625
>>> price + _
113.0625
>>> round(_,2) #取小數點後2位精度
113.06
>>>