两个list转换成dict

list_num = [1,2,3]

list_str = ['a','b','c']

print(dict(zip(list_num, list_str)))

两个字典合并：

dict1 = {'a':1, 'b':2, 'c':3}

dict2 = {'q':1, 'w':2, 'e':3}

print(dict(dict1, **dict2))

{'a': 1, 'b': 2, 'c': 3, 'q': 1, 'w': 2, 'e': 3}

字符串转换成dict

str ="{'a': 1, 'b': 2, 'c': 3}"

print(eval(str))

print(type(eval(str)))

<class 'dict'>

{'a': 1, 'b': 2, 'c': 3}

嵌套排序

以第二个索引元素排序

list_sort1 = [(1, 2), (2, 3), (3, 4)]

print(sorted(list_sort1, key=lambda x: x[1], reverse=True))

打印：[(3, 4), (2, 3), (1, 2)]

dict1 = {'d': 4, 'a': 1, 'b': 2, 'c': 3}

print(sorted(dict1.items(), key=lambda x: x[1], reverse=False))

打印：[('a', 1), ('b', 2), ('c', 3), ('d', 4)]