On Sun, Feb 23, 2020 at 12:10:24AM -0500, Ricky Teachey wrote:
> I've only been at it for about 3 years, but because of iterable strings I
> always seem to regret not using a function like this in many contexts:
>
> def iter_nostr(iterable):
> if isinstance(iterable, str):
> raise TypeError(f"iterable cannot be a str")
Why is that a f-string? It's a static message. That's kind of like
writing `x += eval('1')`.
> yield from iter(iterable)
That would be better written as `return iter(iterable)`, and possibly
more efficient too (I think).
> The nature of my coding work is a lot of parsing of different kinds of text
> files and so I've had to write a lot of functions that are meant to take in
> an iterable of strings. So the biggest context that comes to mind is to
> guard against future me mistakenly sending a string into functions that are
> intended to work with iterables of strings.
Have you considered writing the functions to accept either a single
string or an iterable of strings?
Assuming they all take a single iter-of-strings argument as first
argument, you could do that with a simple decorator:
def decorate(func):
@functools.wraps(func)
def inner(iter_of_strings, *args, **kw):
if isinstance(iter_of_strings, str):
iter_of_strings = (iter_of_strings,)
return func(iter_of_strings, *args, **kw)
return inner
--
Steven
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