Index Solution - Intro to Computer ScienceYouTube↗  IA↗(long shot)
Education  1.6K views 15 likes 1 dislikes   29 May 2012
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[Evans] Here's 1 way to define find_element using index.
這是使用 index 來定義 find-element 的一種方法
In the case where the element does exist in p,
在元素存在於 p 的情況下
index gives us exactly the result we want.
index 給出我們想要的結果
So we can use an if statement, check that t is in p using t in p,
所以我們可以使用 if 陳述， 使用 t in p 來檢查 t 是否在 p 中
and then if it is, the block for the if returns that value.
如果 t 在 p 中，if 程式塊傳回那個值
It returns p.index(t).
它傳回 p.index(t)
For the else clause the element did not exist in p,
對於這個 else 子句，元素不在 p 中
so we return -1.
我們傳回 -1
Here's another way we might define find_element using index.
還有另一種使用 index 的方法來定義 find-element
Instead of checking if t is in p this time, we'll check if t is not in p.
這次我們不檢查 t 是否 in p ，而是檢查 t 是否 not in p
If t is not in p, then we know the result is -1.
如果 t 不在 p ， 我們知道結果是 -1
We can return -1 right away.
我們可以立即傳回 -1
If we reach the next statement, then we know that t is in p
如果我們到達下一個陳述，那麼我們知道 t 存在於 p
and we can return the result of p.index, passing in t.
我們可以傳回 p.index 的結果，傳入 t
So we've seen 4 different ways to define the find_element method.
我們看到了 4 種不同方法來定義 find-element
They all have the same behavior, but we've defined it once with a while loop,
它們的作用完全相同，我們一次用 while loop
once with a for-loop, and 2 different ways using the index method.
一次用 for loop、也用兩種不同 index method 進行定義
When we use index, we need to use an if statement as well
使用 index 時，我們需要使用 if 陳述
to make sure that we produce the right result for the case where the element is not in p.
以確保元素不存在於 p 的情況下，產生正確的結果
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