[issue27707] List reports incorrect length if modifed after yield

Stéphane Wirtel added the comment: when you yield, the list is empty, in this case, the length of your list is just 0 and not 1. -- nosy: +matrixise status: open -> closed ___ Python tracker __

[issue27707] List reports incorrect length if modifed after yield

Changes by Stéphane Wirtel : -- status: closed -> open ___ Python tracker ___ ___ Python-bugs-list mailing list Unsubscribe: https://

[issue27707] List reports incorrect length if modifed after yield

SilentGhost added the comment: At the time the len function in list comprehension is called .append has not executed, the len call in list comprehension operates on object as it is, whereas the object itself is only referenced rather than copied. If you were to copy the yielded list, then a mo

[issue27707] List reports incorrect length if modifed after yield

New submission from Robin: reproduction script below. In the last print statement, it shows me a list with items in it, but with a length of 0 def generator(): l = [] yield l l.append(1) # this correctly prints 1 print(len(l)) # this should print [([1],