从字典列表中创建一组键

Question

我想从列表中创建一个条目，其条目是字典。 知道如何用简短的Python语法做到这一点吗？

自：

[{"a":45,"b":2,"c":"house"},{"a":36,"d":67,"e":"car"}]

要：

{"a","b","c","d","e"}

谢谢！

Answer 1

试试这个：

lst = [ {"a":45, "b":2, "c":"house"}, {"a":36, "d":67, "e":"car"} ]
{ k for d in lst for k in d }
=> set(['a', 'c', 'b', 'e', 'd'])

请注意，我在问题的正文中返回了一个无序的集，但是您正在使用这些键打印列表，但是问题的标题表明需要一组密钥。

Answer 2

简短的语法是：

>>> dicts = [{"a":45,"b":2,"c":"house"},{"a":36,"d":67,"e":"car"}]
>>> set().union(*dicts)
set(['a', 'c', 'b', 'e', 'd'])

Answer 3

mySet = set([])
for l in dictList:
    mySet = mySet.union(set(list(l)))