On 08:45 am, tjre...@udel.edu wrote:
Tom Machinski wrote:
In most cases, `list(generator)` works as expected. Thus,
`list(<generator expression>)` is generally equivalent to `[<generator
expression>]`.
Here's a minimal case where this equivalence breaks, causing a serious
and hard-to-detect bug in a program:
>>> def sit(): raise StopIteration()
StopIteration is intended to be used only within the .__next__ method
of iterators. The devs know that other 'off-label' use results in the
inconsistency you noted, but their and my view is 'don't do that'.
Which is unfortunate, because it's not that hard to get StopIteration
without explicitly raising it yourself and this behavior makes it
difficult to debug such situations.
What's with this view, exactly? Is it just that it's hard to implement
the more desirable behavior?
Jean-Paul
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