python 列表,元组,集合转换成字典
dict 字典类型的强制转换
""" 要求: 必须是等长的二级容器,并且里面的元素个数是2个; 外层是列表,元组,集合 , 里层是列表或者元组的等长二级容器 => 字典; """ # 1.外层是列表,里层是列表或者元组 lst = [ ["a",1] , ("b",2) ] dic = dict(lst) print(dic , type(dic)) # {'a': 1, 'b': 2} <class 'dict'> # 2.外层是元组,里层是列表或者元组 tup = ( ["a",1] , ("b",2) ) dic = dict(tup) print(dic , type(dic)) # 3.外层是集合,里层是元组 setvar = { ("a",1) , ("b",2) } dic = dict(setvar) print(dic , type(dic)) # 例外1:外层是列表/元组,里层放集合 """可以实现,不推荐使用,因为达不到想要的目的,集合无序,不推荐使用""" lst = [ ["a",1] , {"b","250"} ] dic = dict(lst) print(dic) # 例外2:外层是列表/元组,里层放字符串 """ 字符串长度只能是2位,有极大的局限性,不推荐使用""" lst = ["a1","b2"] # lst = ["a11","b22"] error # dic = dict(lst) # print(dic)