本篇總結了一下字符串，列表，字典，元組的連接組合使用和類型的互相轉換小例子，尤其列表中的extend()方法和字典中的

update方法非常的常用。

1.連接兩個字符串

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

2.字典的連接

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

3.列表的連接

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

4.元組的連接

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

5.字典轉換為字符串

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

6.字典轉換為列表

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.字典轉換為元組

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.列表轉換為字符串

list1 = [1, 2, 3] str1 = str(list1) print(str1) # [1, 2, 3] print(type(str1)) # <class 'str'>

9.列表轉換為字典

# 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.列表轉換為元組

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

11.元組轉換為字符串

tuple1 = (1, 2, 3) str1 = tuple(tuple1) print(str1) # (1, 2, 3) print(type(str1)) # <class 'tuple'>

12.元組轉換為字典

# 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.元組轉換為列表

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