在Python中将元组列表分组到字典中

Question

我想把这张单子变成一段口述，如下所示：

somelist = [("facultyX", "memberA", "Student"),
            ("facultyX", "memberB", "Student"),
            ("facultyX","memberC", "Programmer"), 
            ("facultyY", "memberD", "Student"), 
            ("facultyY", "memberE","PostDoc")]

result = {'facultyX':{'Student':['memberA','memberB'],
                      'Programmer':['memberC']},
          'facultyY':{'Student':['memberD'],
                      'PostDoc':['memberE']}}

Answer 1

稍微撒一点dict.setdefault()这并不难：

result = {}

for fac, member, role in yourlist:
    fac_data = result.setdefault(fac, {})
    fac_data.setdefault(role, []).append(member)

演示：

^{pr2}$