python 字典
資料型別的分類
可變(不可雜湊)的：list dict set
不可變(可雜湊)的：str bool int tuple
1. 列表的建立
方法一：
l1 = [1,2,"哈哈哈"]
li = list()2. 增
insert
extend
li = ["520","python",123]
print(li)
li.insert(1,"哈哈哈") #按索引插入，把「哈哈哈」插入到索引為1的位置
print(li)
li.extend("abc123") #extend是迭代增加
print(li)
none
li = ["蘋果","香蕉","菠蘿"]
li.extend(["番茄","青菜"])
print(li)
print(li)
['蘋果', '香蕉', '菠蘿', '番茄', '青菜']
['蘋果', '香蕉', '菠蘿', '番茄', '青菜', ['中國', '上海']]
#pop()
li = ["蘋果","香蕉","菠蘿","火龍果","西瓜","柿子"]
print(li.pop()) #預設刪除最後乙個元素
print(li.pop(2)) #按索引刪
print(li)
柿子
菠蘿['蘋果', '香蕉', '火龍果', '西瓜']
#remove()
li = ["蘋果","香蕉","蘋果","西瓜"]
li.remove("蘋果")
print(li)
['香蕉', '蘋果', '西瓜']#clear
li = ["蘋果","香蕉","蘋果","西瓜"]
li.clear()
print(li)
#del
li = ["蘋果","香蕉","菠蘿","蘋果","西瓜","水蜜桃","橘子"]
del li[3] #按索引刪
print(li)
del li[::3] #按切片刪
print(li)
del li #把這個li刪了。print(li)會報錯
['蘋果', '香蕉', '菠蘿', '西瓜', '水蜜桃', '橘子']
['香蕉', '菠蘿', '水蜜桃', '橘子']
#直接改
li = ["蘋果","香蕉","水蜜桃","橘子"]
li[-2] = "hhhh"
print(li)
['蘋果', '香蕉', 'hhhh', '橘子']#切片改
li = ["蘋果","香蕉","菠蘿","蘋果","西瓜","水蜜桃","橘子"]
li[2:] = "hh"
print(li)
['蘋果', '香蕉', 'h', 'h']#方法一：
li = ["蘋果","香蕉","菠蘿","蘋果","西瓜","水蜜桃","橘子"]
del li[2:]
print(li)
#方法二
li = ["蘋果","香蕉","菠蘿","蘋果","西瓜","水蜜桃","橘子"]
li[2:]=['hh']
li = ["蘋果","香蕉","菠蘿","蘋果","西瓜","水蜜桃","橘子"]
print(li[-3])
print(li[::2])
西瓜
['蘋果', '菠蘿', '西瓜', '橘子']
資料型別的分類
可變(不可雜湊)的：list dict set
不可變(可雜湊)的：str bool int tuple
1. 列表的建立
方法一：
l1 = [1,2,"哈哈哈"]
li = list()2. 增
insert
extend
li = ["520","python",123]
print(li)
li.insert(1,"哈哈哈") #按索引插入，把「哈哈哈」插入到索引為1的位置
print(li)
li.extend("abc123") #extend是迭代增加
print(li)
none
li = ["蘋果","香蕉","菠蘿"]
li.extend(["番茄","青菜"])
print(li)
print(li)
['蘋果', '香蕉', '菠蘿', '番茄', '青菜']
['蘋果', '香蕉', '菠蘿', '番茄', '青菜', ['中國', '上海']]
#pop()
li = ["蘋果","香蕉","菠蘿","火龍果","西瓜","柿子"]
print(li.pop()) #預設刪除最後乙個元素
print(li.pop(2)) #按索引刪
print(li)
柿子
菠蘿['蘋果', '香蕉', '火龍果', '西瓜']
#remove()
li = ["蘋果","香蕉","蘋果","西瓜"]
li.remove("蘋果")
print(li)
['香蕉', '蘋果', '西瓜']#clear
li = ["蘋果","香蕉","蘋果","西瓜"]
li.clear()
print(li)
#del
li = ["蘋果","香蕉","菠蘿","蘋果","西瓜","水蜜桃","橘子"]
del li[3] #按索引刪
print(li)
del li[::3] #按切片刪
print(li)
del li #把這個li刪了。print(li)會報錯
['蘋果', '香蕉', '菠蘿', '西瓜', '水蜜桃', '橘子']
['香蕉', '菠蘿', '水蜜桃', '橘子']
#直接改
li = ["蘋果","香蕉","水蜜桃","橘子"]
li[-2] = "hhhh"
print(li)
['蘋果', '香蕉', 'hhhh', '橘子']#切片改
li = ["蘋果","香蕉","菠蘿","蘋果","西瓜","水蜜桃","橘子"]
li[2:] = "hh"
print(li)
['蘋果', '香蕉', 'h', 'h']#方法一：
li = ["蘋果","香蕉","菠蘿","蘋果","西瓜","水蜜桃","橘子"]
del li[2:]
print(li)
#方法二
li = ["蘋果","香蕉","菠蘿","蘋果","西瓜","水蜜桃","橘子"]
li[2:]=['hh']
li = ["蘋果","香蕉","菠蘿","蘋果","西瓜","水蜜桃","橘子"]
print(li[-3])
print(li[::2])
西瓜
['蘋果', '菠蘿', '西瓜', '橘子']
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