将 pandas 数据框转换为唯一元组列表

将 pandas 数据框转换为唯一元组列表的最有效方法是什么？ 在下面的代码中，我尝试提取包含所有唯一的元组列表PostalCode and Age.

from typing import NamedTuple, Sequence, Tuple

import pandas as pd

data = [["tom", 10, "ab 11"], ["nick", 14, "ab 22"], ["juli", 10, "ab 11"]]
people = pd.DataFrame(data, columns=["Name", "Age", "PostalCode"])

subset = pd.unique(people[["PostalCode", "Age"]].values.ravel())

# This produce an error
output = list(subset.itertuples(index=False))

# Expected output
# [('ab 11', 10), ('ab 22', 14)]

Try Groupby.groups https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.core.groupby.GroupBy.groups.html:

list(people.groupby(['PostalCode', 'Age']).groups)

[out]

[('ab 11', 10), ('ab 22', 14)]