class MyRange(object):

def __init__(self, low, high):

self.low = low

self.high = high

def __iter__(self):

return MyRangeIterator(self.low, self.high)

def skip(self, to_skip):

return MyRangeIterator(self.low, self.high, to_skip)

class MyRangeIterator(object):

def __init__(self, low, high, skip=None):

self.current = low

self.high = high

self.skip = skip

def __next__(self):

if self.current >= self.high:

raise StopIteration

to_return = self.current

self.current += 1

if self.skip and to_return in self.skip:

return self.__next__()

return to_return

# Problem is fixed by uncommenting these lines

# def __iter__(self):

# return self

my_range = MyRange(0,10)

x = sum(my_range) # x = 45

y = sum(my_range.skip({6,9})) # TypeError: 'MyRangeIterator' object is not iterable