python全栈开发《67.不同数据类型间的转换：列表集合元组的转换》

清菡

发布于 2024-11-28 13:05:31

6500

代码可运行

文章被收录于专栏：清菡软件测试清菡软件测试

运行总次数：0

代码可运行

列表、元组和集合间转换的函数

例1:

# coding:utf-8

a = [1,2,3]
b = (1,2,3)
c = {1,2,3}
print(tuple(a),set(a))
print(type(tuple(a)),type(set(a)))
print(tuple(a) is b)
print(set(a) is c)

运行结果：

/Users/llq/PycharmProjects/pythonlearn/pythonlearn/change/bin/python /Users/llq/PycharmProjects/pythonlearn/change/change_list_tuple_set.py 
(1, 2, 3) {1, 2, 3}
<class 'tuple'> <class 'set'>
False
False

进程已结束，退出代码为 0

运行结果显示False，是因为a和b不是相同的内存地址。

例2:

# coding:utf-8

a = [1,2,3]
b = (1,2,3)
c = {1,2,3}
print(tuple(a),set(a))
print(type(tuple(a)),type(set(a)))
print(tuple(a) is b)
print(set(a) is c)

print(list(b),set(b))
print(list(c),tuple(c))

print(list(a))#运行结果：[1,2,3]，没有任何的变化。

print(str(a),type(str(a)))#运行结果：'[1,2,3]'
print(str(b),type(str(b)))
print(str(c),type(str(c)))

print(list(str(a)))
print(tuple(str(b)))
print(set(str(c)))

_a = str(a)
_b = list(_a)
print(_b)

运行结果：

/Users/llq/PycharmProjects/pythonlearn/pythonlearn/change/bin/python /Users/llq/PycharmProjects/pythonlearn/change/change_list_tuple_set.py 
(1, 2, 3) {1, 2, 3}
<class 'tuple'> <class 'set'>
False
False
[1, 2, 3] {1, 2, 3}
[1, 2, 3] (1, 2, 3)
[1, 2, 3]
[1, 2, 3] <class 'str'>
(1, 2, 3) <class 'str'>
{1, 2, 3} <class 'str'>
['[', '1', ',', ' ', '2', ',', ' ', '3', ']']
('(', '1', ',', ' ', '2', ',', ' ', '3', ')')
{' ', '{', '1', '}', '2', '3', ','}
['[', '1', ',', ' ', '2', ',', ' ', '3', ']']

进程已结束，退出代码为 0