A single-name unpacking assignment can do exactly what you want, albeit
with slightly less helpful exception messages:
jack, = (p for p in people if p.id == '1234') # note comma after the
name jack
If no value is yielded by the generator expression, you'll get "ValueError:
not enough values to unpack (expected 1, got 0)". If multiple values are
yielded, you'll instead get "ValueError: too many values to unpack
(expected 1)".
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