# list ## 輸入 ```python= #1 a = [int(i) for i in input().split()] #2 a = list(map(int, input().split())) # 不能這樣寫 a = [map(int, input().split())] ``` ## 輸出 ```python= a = [1, 2, 3] #1 print(a) #[1, 2, 3] #2 print(' '.join(map(str, a))) #1 2 3 ``` ## 加入、刪除 ::: success `element` : 變數 ::: ### 1. append ```python= a.append(element) #在a後面插入element ``` ex: ```python= a = [1, 2, 3] a.append(4) # a = [1, 2, 3, 4] ``` ### 2. pop ```python= a.pop(pos) #刪除a中pos位置的元素 ``` ex: ```python= a = [1, 2, 3] a.pop(0) # a = [2, 3] ``` ### 3. insert ```python= a.insert(pos, element) # 在a的pos中加入element ``` ex: ```python= a = [1, 2, 3] a.insert(2, 4) # a = [1, 2, 4, 3] ``` ### 4. remove ```python= a.remove(element) #在a中刪除element ``` ex: ```python= a = [1, 2, 3] a.remove(1) # a = [2, 3] ``` ## 排序 ### 1. sort ```python= a.sort(key=) ``` :::success key 不一定要加 ::: ex: ```python= a = [3, 2, 1] a.sort() # a = [1, 2, 3] ``` ## 找尋元素位置 ### 1. index ```python= a.index(element) ``` ex: ```python= a = [1, 2, 3] a.index(1) # 0 ``` # 補充 ## pythonic ### 1. 取區間元素 ```python= a[start : end] # 取a陣列裡面[start, end) # start 預設第一個，end 預設 ``` ex: ```python= a = [1, 2, 3, 4, 5] print(a[0:3]) #1, 2, 3 ``` ### 2. 翻轉陣列 1. reverse ```python= a.reverse() ``` 2. [::-1] ex. ```python= a = [1, 2, 3] a = a[::-1] # a = [3, 2, 1] ``` ### 3. 輸出進階版 ```python= a = [1, 2, 3] #1 print(*a) #1 2 3 #2 print(*a, sep = ',') #1, 2, 3 ```