本篇总结了一下字符串，列表，字典，元组的连接组合使用和类型的互相转换小例子，尤其列表中的extend()方法和字典中的
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)) # <class 'str'> |
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)) # <class 'str'> |
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)) # <class 'tuple'> |
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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