我有一段代码,其中函数foo返回一个字典。
def foo():
# do something here
# get data from web
return {
"book": {ln : wd for ln, wd, _ in data["book"]},
"note": {ln : wd for ln, wd, _ in data["note"]},
}
def bar():
data = foo()
# how to access 0th element of data["book"]
# data["book"][0] doesnt work
问题是如何访问它的第一个元素?