容器比較

容器(Containers)有list,tuple,str,set,dict。

說明 list tuple str set dict
元素類型 任意類型 任意類型 字串 任意 key字串數字,value任意類型
元素能重覆 可 可 可 不可 key不可,value可
是否有順序 是 是 是 不是 3.6以後是
是否有索引 是 是 是 無 無
可修改 是 否 否 是 是
符號 [] () "" {} {key:value}

容器互相轉型

list 轉 string

使用str(obj)函式，可以把list轉成字串，雖然執行結果res: ['Hello', 'World', 'May']有方括號，但這一串都是字串，後面的type有顯示res的類型為字串。

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list1 = ["Hello", "World", "May"]
res = str(list1)
print(f"res: {res} , type = {type(res)}")

res: ['Hello', 'World', 'May'] , type = <class 'str'>

tuple 轉 string

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tuple1 = ("Hello", "World", "May")
res = str(tuple1)
print(f"res: {res} , type = {type(res)}")

res: ('Hello', 'World', 'May') , type = <class 'str'>

dict 轉 string

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dict1 = {"key1": "value1", "key2": "value2"}
res = str(dict1)
print(f"res: {res} , type = {type(res)}")

res: {'key1': 'value1', 'key2': 'value2'} , type = <class 'str'>

set 轉 string

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set1 = {"H", "E", "H", "E"}
res = str(set1)
print(f"res: {res} , type = {type(res)}")

res: {'E', 'H'} , type = <class 'str'>

其它容器轉list

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str1 = "Hello"
tuple1 = ("Mary", "Bill")
set1 = {"Mary", "Bill"}
dict1 = {"name": "Mary", "age": 25}
print(f"str1 convert list = {list(str1)}")
print(f"tuple1 convert list = {list(tuple1)}")
print(f"set1 convert list = {list(set1)}")
print(f"dict1 convert list = {list(dict1)}")

str1 convert list = ['H', 'e', 'l', 'l', 'o']
tuple1 convert list = ['Mary', 'Bill']
set1 convert list = ['Mary', 'Bill']
dict1 convert list = ['name', 'age']

其它容器轉tuple

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str1 = "Hello"
list1 = [1,2,3,4,5]
tuple1 = ("Mary", "Bill")
set1 = {"Mary", "Bill"}
dict1 = {"name": "Mary", "age": 25}
print(f"str1 convert tuple = {tuple(str1)}")
print(f"list1 convert tuple = {tuple(list1)}")
print(f"set1 convert tuple = {tuple(set1)}")
print(f"dict1 convert tuple = {tuple(dict1)}")

str1 convert tuple = ('H', 'e', 'l', 'l', 'o')
list1 convert tuple = (1, 2, 3, 4, 5)
set1 convert tuple = ('Mary', 'Bill')
dict1 convert tuple = ('name', 'age')

其它容器轉set

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str1 = "Hello"
list1 = [1,2,3,4,5]
tuple1 = ("Mary", "Bill")
set1 = {"Mary", "Bill"}
dict1 = {"name": "Mary", "age": 25}
print(f"str1 convert set = {set(str1)}")
print(f"list1 convert set = {set(list1)}")
print(f"tuple1 convert set = {set(tuple1)}")
print(f"dict1 convert set = {set(dict1)}")

str1 convert set = {'e', 'l', 'o', 'H'}
list1 convert set = {1, 2, 3, 4, 5}
tuple1 convert set = {'Mary', 'Bill'}
dict1 convert set = {'name', 'age'}

說明文件

list

tuple

string

set

dict

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