ccessing items and slices with negative indexes
accessing items and slices with negative indexes
>>> monday = [1.1,2.2,3.3,4.4,5.5]
>>> monday[-1] //////如果你想直接取最後一個數,不必從頭數數
5.5
>>> monday[-1:-2] /////////取切片也是一樣,要注意的是如果像這樣左右寫反是不行的
[]
>>> monday[-2:-1]/////////還有就是即使是負數也是左邊的那個數不取
[4.4]
>>> monday[: -1]
[1.1, 2.2, 3.3, 4.4]
>>> monday[-2:-5]
[]
>>> monday[-5:]
[1.1, 2.2, 3.3, 4.4, 5.5]
這個計數系統就目前list裡面只有較少的資料來看除了 單取 最後一個數比較方便 取切片都一樣(個人來說更容易混淆)
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ccessing items and slices with negative indexes
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