虽然您可以将其折叠成一个循环，但这是不值得的:

While you could collapse this into one loop, it's not worth it:

from itertools import chain
from operator import itemgetter

for val in chain.from_iterable(map(itemgetter('key2'), dicts)):
    print("value:", val)

保留嵌套循环并放下笨拙的range-len更具可读性:

It's more readable to just keep the nested loops and drop the awkward range-len:

for d in dicts:
    for val in d['key2']:
        print("value:", val)