On 2020-02-20 13:30, David Wihl wrote:
> I believe that it would be more idiomatic in Python (and other
> languages like Ruby) to throw an exception when one of these
> partial errors occur. That way there would be the same control flow
> if a major or minor error occurred.
There are a variety of ways to do it -- I like Ethan's suggestion
about tacking the failures onto the exception and raising it at the
end. But you can also yield a tuple of success/failure iterators,
something like this pseudocode:
def process(input_iter):
successes = []
failures = []
for thing in input_iter:
try:
result = process(thing)
except ValueError as e: # catch appropriate exception(s) here
failures.append((e, thing))
else:
successes.append((result, thing))
return successes, failures
def process(item):
if item % 3:
raise ValueError("Must be divisible by 3!")
else:
print(item)
return item // 3
successes, failures = process(range(10))
for reason, thing in failures:
print(f"Unable to process {thing} because {reason}")
-tkc
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