An extension to Python standard library itertools
chaincall - chains function calls so that result of previous function is passed as argument to next one.
import iterextra
to_bool = iterextra.chaincall(int, bool)
assert to_bool("1")
assert not to_bool("0")pick - helper function to make fetching member of list of objects a little more clear
import iterextra
lst = [complex(1.0, 2.0), complex(1.5, 2.5)]
assert map(pick('imag'), lst) == [1.5, 2.5]