def sequenceequal(first, second, selector=None):
selector = Function(selector, arity=1)
first, second = compatible.imap(list, [first, second])
if len(first) != len(second):
return False
for a, b in compatible.izip(first, second):
if selector(a) != selector(b):
return False
return True
def select(iterable, selector):
selector = Function(selector, arity=1)
return compatible.imap(selector, iterable)
