python基础之数据类型之间的转换

1、str类型转int类型，字符串与整形互转

>>> a = '10'
>>> b = int(a)
>>> print(type(a))

>>> print(type(b))

2、将str字符串转换成列表list

>>> Test_str = "python was created in 1989,python is using in AI，big data,IOT."
>>> newTest_str = list(Test_str)
>>> print(type(Test_str))

>>> print(type(newTest_str))

3、将str字符串转换成字典dict(json规定,数组或对象之中的字符串必须是用双引号，不能用单引号)

>>> test = '{"name": "linda", "age": "18"}'
>>> test_dict = json.loads(test)
>>> print(type(test))

>>> print(type(test_dict))

4、将str字符串转换成set

>>> geeks = "geeks"
>>> print(str(type(geeks)))

>>> set_geeks = set(geeks)
>>> print(type(set_geeks))

5、列表list转换成字符串str（list [ ] 中包含的元素是str " "类型）

>>> list_str1= ["你好","hello","world"]
>>> list_str2="".join(list_str1)
>>> print(list_str2)
你好helloworld

6、列表list转换成元组tuple

list1 = ['a', 'b', 'c']
var2 = tuple(list1)
print(var2)

7、嵌套元组tuple转换字典dict

a = (("name", "lisa"), ("sex", "nale"))
var3 = dict(a)
print(var3)

8、把元组(1,2,3,4,5,6)元素格式化成字符串

tupl = (1, 2, 3, 4, 5, 6)
new = f"{tupl}"
new1 = "{0}".format(tupl)
print(new)
print(type(new))

9、将字典dict转化为字符串str

b = {"name": "linda", "age": "18"}
str_b = repr(b)
print(str_b[0:3])

10、字典转json使用：json.dumps()

11、json转字典使用：json.loads()