custom_range.py

class CustomRange:
  def __init__(self, max):
    self.max = max
  
  def __iter__(self):
    self.curr = 0
    return self

  def next(self):
    numb = self.curr
    if self.curr >= self.max:
        raise StopIteration
    self.curr += 1
    return numb

for i in CustomRange(10):
  print i