Sequence find function in Python

Question

How do I find an object in a sequence satisfying a particular criterion?

List comprehension and filter go through the entire list. Is the only alternative a handmade

Answer 1

If you only want the first greater than 10 you can use itertools.ifilter:

import itertools
first_gt10 = itertools.ifilter(lambda x: x>10, [10, 2, 20, 5, 50]).next()

If you want all greater than 10, it may be simplest to use a list-comprehension:

all_gt10 = [i for i in mylist if i > 10]