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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)) #

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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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