On Thu, Jun 28, 2018 at 5:12 PM Chris Barker via Python-ideas <
[email protected]> wrote:
> In [97]: student_school_list
> Out[97]:
> [('Fred', 'SchoolA'),
> ('Bob', 'SchoolB'),
> ('Mary', 'SchoolA'),
> ('Jane', 'SchoolB'),
> ('Nancy', 'SchoolC')]
>
> In [98]: result = defaultdict(list, student_by_school)
>
> In [99]: result.items()
> Out[99]: dict_items([('SchoolA', ['Fred', 'Mary']), ('SchoolB', ['Bob',
> 'Jane']), ('SchoolC', ['Nancy'])])
>
Wait, wha...
In [1]: from collections import defaultdict
In [2]: students = [('Fred', 'SchoolA'),
...: ('Bob', 'SchoolB'),
...: ('Mary', 'SchoolA'),
...: ('Jane', 'SchoolB'),
...: ('Nancy', 'SchoolC')]
...:
In [3]: defaultdict(list, students)
Out[3]:
defaultdict(list,
{'Fred': 'SchoolA',
'Bob': 'SchoolB',
'Mary': 'SchoolA',
'Jane': 'SchoolB',
'Nancy': 'SchoolC'})
In [4]: defaultdict(list, students).items()
Out[4]: dict_items([('Fred', 'SchoolA'), ('Bob', 'SchoolB'), ('Mary',
'SchoolA'), ('Jane', 'SchoolB'), ('Nancy', 'SchoolC')])
I think you accidentally swapped variables there:
student_school_list
vs student_by_school
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