iter_max

# -*- coding: utf-8 -*-
from __future__ import absolute_import, unicode_literals


def find_max(iterable):
    iterator = iter(iterable)

    def find_iter(current_max):
        try:
            current = next(iterator)
        except StopIteration:
            return current_max
        else:
            current_max = current_max if current_max >= current else current
            return find_iter(current_max)

    try:
        return find_iter(next(iterator))
    except StopIteration:
        raise Exception('Not possible finding max of empty')


print(find_max(range(3)))