Unpacking dictionaries of lists

Question

The following fails in Python 3.5:

for key, (a, b) in {'my_key': ('foo', 'bar')}:
  print(key, a, b)

with:

ValueError: too many values to unpack (expected 2)

Why is it unable to unpack the tuple properly?

Have you looked at how Python iterates over dicts? It only iterates over the keys if you use a default for... in — Two-Bit Alchemist, Jun 28 '16 at 19:05

score 2 · Accepted Answer · edited May 23 '17 at 11:52

2

If you use the items() method on the dictionary, it will work.

>>> for key, (a,b) in {'my_key': ('foo','bar')}.items():
...     print(key, a, b)
...
my_key foo bar

edited May 23 '17 at 11:52

Community

answered Jun 28 '16 at 19:36

arewm

1 Answers1