Wolfgang Maier wrote: > On 1/6/2017 15:04, Peter Otten wrote: >> Example: you are looking for the minimum absolute value in a series of >> integers. As soon as you encounter the first 0 it's unnecessary extra >> work to check the remaining values, but the builtin min() will continue. >> >> The solution is a minimum function that allows the user to specify a stop >> value: >> >>>>> from itertools import count, chain >>>>> stopmin(chain(reversed(range(10)), count()), key=abs, stop=0) >> 0 >> >> How would you implement stopmin()? >> > > How about: > > def stopmin (iterable, key, stop): > def take_until (): > for e in iterable: > yield e > if key(e) <= stop: > break > return min(take_until(), key=key) > > ?
Clean and simple -- if it could be tweaked to invoke key() just once per item it would be perfect. -- https://mail.python.org/mailman/listinfo/python-list
