Python中基本类型的连接组合和互相转换的方式

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update方法非常的常用。

1.连接两个字符串

a = "hello " b = "world" a += b print(a)  # hello world

2.字典的连接

dict1 = {1: "a", 2: "b"} dict2 = {3: "c", 4: "d"} dict1.update(dict2) print(dict1)  # {1: 'a', 2: 'b', 3: 'c', 4: 'd'}

3.列表的连接

list1 = [1, 2, 3] list2 = [4, 5, 6] list1.extend(list2)  # [1, 2, 3, 4, 5, 6] print(list1)

4.元组的连接

tuple1 = (1, 2) tuple2 = (3, 4) tuple1 += tuple2 print(tuple1)  # (1, 2, 3, 4)

5.字典转换为字符串

dict1 = {1: "a", 2: "b"} str1 = str(dict1) print(str1)  # {1: 'a', 2: 'b'} print(type(str1))  # 

6.字典转换为列表

dict1 = {1: "a", 2: "b"} list1 = list(dict1.keys()) list2 = list(dict1.values()) list3 = list(dict1) print(list1)  # [1, 2] print(list2)  # ['a', 'b'] print(list3)  # [1,2]

7.字典转换为元组

dict1 = {1: "a", 2: "b"} tuple1 = tuple(dict1.keys()) tuple2 = tuple(dict1.values()) tuple3 = tuple(dict1) print(tuple1)  # (1, 2) print(tuple2)  # ('a', 'b') print(tuple3)  # (1, 2)

8.列表转换为字符串

list1 = [1, 2, 3] str1 = str(list1) print(str1)  # [1, 2, 3] print(type(str1))  # 

9.列表转换为字典

# 1. list1 = [1, 2, 3] list2 = ["a", "b", "c"] dict1 = dict(zip(list1, list2)) print(dict1)  # {1: 'a', 2: 'b', 3: 'c'} # 2. dict1 = {} for i in list1:     dict1[i] = list2[list1.index(i)] print(dict1)  # {1: 'a', 2: 'b', 3: 'c'} # 3. list1 = [[1, 'a'], [2, 'b'], [3, 'c']] dict1 = dict(list1) print(dict1)  # {1: 'a', 2: 'b', 3: 'c'}

10.列表转换为元组

list1 = [1, 2, 3] tuple1 = tuple(list1) print(tuple1)  # (1, 2, 3)

11.元组转换为字符串

tuple1 = (1, 2, 3) str1 = tuple(tuple1) print(str1)  # (1, 2, 3) print(type(str1))  # 

12.元组转换为字典

# 1. tuple1 = (1, 2, 3) tuple2 = (4, 5, 6) dict1 = dict(zip(tuple1, tuple2)) print(dict1)  # {1: 4, 2: 5, 3: 6} # 2 dict1 = {} for i in tuple1:     dict1[i] = tuple2[tuple1.index(i)] print(dict1)  # {1: 4, 2: 5, 3: 6}  # 3 tuple1 = (1, 2) tuple2 = (4, 5) tuple3 = (tuple1, tuple2) dict1 = dict(tuple3) print(dict1)  # {1: 2, 4: 5}

13.元组转换为列表

tuple1 = (1, 2) list1 = list(tuple1) print(list1)  # [1, 2]

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