On 1/12/2016 11:50 AM, Nick Mellor wrote:
Hi all,
Seemingly simple problem:
There is a case in my code where I know a dictionary has only one item in it. I
want to get the value of that item, whatever the key is.
In Python2 I'd write:
d = {"Wilf's Cafe": 1}
d.values()[0]
1
and that'd be an end to it.
In Python 3:
d = {"Wilf's Cafe": 1}
d.values()[0]
Traceback (most recent call last):
File "<input>", line 1, in <module>
TypeError: 'dict_values' object does not support indexing
The intended use of dict views: "Dictionary views can be iterated over
to yield their respective data, and support membership tests:"
"Wilf's Cafe"
d[list(d)[0]]
1
for k in d:
... value = d[k]
... break
...
value
1
list(d.values())[0]
1
None of this feels like the "one, and preferably only one,
> obvious way to do it" we all strive for. Any other ideas?
Using the values views at intended (as an iterable):
>>> dv = d.values()
>>> next(iter(dv))
1
--
Terry Jan Reedy
--
https://mail.python.org/mailman/listinfo/python-list
