yield-from – Tarik Billa

yield from vs yield in for-loop

January 8, 2024 by Tarik

What Happened? When you use next(iter(instance_of_Class2)), iter() calls .close() on the inner generator when it (the iterator, not the generator!) goes out of scope (and is deleted), while with Class1, iter() only closes its instance >>> g = (i for i in range(3)) >>> b = Class2(g) >>> i = iter(b) # hold iterator open … Read more

Converting “yield from” statement to Python 2.7 code

February 14, 2023 by Tarik

If you don’t use the results of your yields,* you can always turn this: yield from foo … into this: for bar in foo: yield bar There might be a performance cost,** but there is never a semantic difference. Are the entries from the two halves (upper and lower) appended to each other in one … Read more