如何通过函数返回字典? [英] How do you return a dictionary through a function?
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问题描述
我正在尝试使用jupyter笔记本通过代码中显示的函数返回字典.我是Python的初学者,不确定如何解决此问题,但我觉得答案很简单.在我运行它的代码中,我得到{}.
I am trying to return a dictionary through a function shown in the code using jupyter notebooks. I am a beginner in Python and not sure how to go about this but I feel the answer is trivial.In my code when i run it, i get {}.
不确定是否需要for循环或if语句.
Im not sure if a for loop or if statement is needed.
def build_book_dict(titles, pages, firsts, lasts, locations):
if True:
return dict()
else:
None
titles = ["Harry Potter", "Fear and Lothing in Las Vegas"]
pages = [200, 350]
firsts = ["J.K.", "Hunter"]
lasts = ["Rowling", "Thompson"]
locations = ["NYC", "Aspen"]
book_dict = build_book_dict(titles, pages, firsts, lasts, locations)
print (book_dict)
result should be -->
{'Fear and Lothing in Las Vegas': {'Publisher': {'Location': 'Aspen'},
'Author': {'Last': 'Thompson', 'First': 'Hunter'}, 'Pages': 350},
'Harry Potter': {'Publisher': {'Location': 'NYC'},
'Author': {'Last': 'Rowling', 'First': 'J.K.'}, 'Pages': 200}}
推荐答案
字典不会自动自动组装并知道您想要的格式.由于您从一个独立的列表开始,因此您可以 zip
分成几组,以轻松地遍历它们并构建您的字典:
The dictionary isn't going to automatically assemble itself and know the format you want. Since you are starting with a independent lists you can zip
them into groups to easily iterate over them and build your dictionary:
def build_book_dict(*args):
d = dict()
for title, page, first, last, location in zip(*args):
d[title] = {"Publisher": {"Location":location},
"Author": {"last": last, "first":first},
"Pages": page}
return d
titles = ["Harry Potter", "Fear and Lothing in Las Vegas"]
pages = [200, 350]
firsts = ["J.K.", "Hunter"]
lasts = ["Rowling", "Thompson"]
locations = ["NYC", "Aspen"]
book_dict = build_book_dict(titles, pages, firsts, lasts, locations)
from pprint import pprint # pretty print
pprint(book_dict)
结果
{'Fear and Lothing in Las Vegas': {'Author': {'first': 'Hunter',
'last': 'Thompson'},
'Pages': 350,
'Publisher': {'Location': 'Aspen'}},
'Harry Potter': {'Author': {'first': 'J.K.', 'last': 'Rowling'},
'Pages': 200,
'Publisher': {'Location': 'NYC'}}}
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