从两个公司名单制作字典

Question

我有两个名单…一个与广告公司和其他与他们的客户…我希望有一个字典格式的输出，显示我与他们服务的所有客户的广告公司

{agency:{company1, company2 etc etc}}

Advertising Agency  Company
WPP Alienware
OMNICOM Alleghany Corporation
XYZ Allegheny Technologies
MEDIACOM    Allegis Group
XYZ Allen Organ Company
MEDIACOM    Allergan
WPP Alliance Rubber Company
OMNICOM Alliant Energy
XYZ Alliant Techsystems
MEDIACOM    Allied Insurance
WPP Allison Transmission
OMNICOM Allstate
XYZ Ally Financial
MEDIACOM    Aloha Air Cargo

Answer 1

一个简单的方法是使用collections.defaultdict：

answer = defaultdict(set)
for agency, company in zip(agencies, companies):
    answer[agency].add(company)