Python 兩個字典的鍵和值如何轉換？

a={'1':'張三',

....'2':'李四',

....'3':'王五'}

b = {'text':[1,2,3],

....'text2':[1,3]}

c = {}

for k,v in b.items():

....c[k] = list(map(lambda _:a[str(_)], v))

print(c)