如何仅从字典列表中获取值，然后在Python中再次将它们放在列表中？

Question

I am running a query in the db and getting the output in a list of dict format. Each list of dict is associated with a id column. Example:

[{'v_key':50},{'v_key':60}] # say here the id is 1
[{'r_key':10}] # here the id is 2 (the output go on like this and key in dict may not be same)

so to loop thru the output of the query i need something like below:

[50,60] # for id 1.(The values to be in a list and this will go on for all the id's)

Answer 1

[v for dct in lst for v in dct.values()] . This will have undefined order if dicts have more than one value.

Answer 2

如果query_result = [{'v_key':50},{'v_key':60}] ，则：

[d['v_key'] for d in query_result]  # [50, 60]