creating our own python iterator created by hygull - https://repl.it/FjID/0

creating our own python iterator.py

"""
	Coded On : 14 Feb 2014.
	Aim      : To create our own iterator in Python.
	Reference link : http://stackoverflow.com/questions/19151/build-a-basic-python-iterator
"""

class Range:
	def __init__(self,start,end):  	#constructor
		self.start = start
		self.end   = end

	def __iter__(self):				#It's implicitly called after __init__()
		return self

	def next(self):					#__next__() in Python3,  it's called implicitly in each iteration(it is like condition testing handler)
		if self.start > self.end:
			raise StopIteration
		else:
			self.start+=1
			return self.start-1

class Range2:
	def __init__(self,start,end):
		print "Initializing start & end..."
		self.start = start
		self.end   = end
		print "start & end initialized..."

	def __iter__(self):
		print "returning self..."
		return self

	def next(self):					#__next__() in Python3
		print "next is called..."
		if self.start > self.end:
			raise StopIteration
		else:
			self.start+=1
			return self.start-1

for i in Range(1,10):
	print i

print "\n"

for i in Range2(1,10):
	print i

"""
admins-MacBook-Pro-3:js-basics admin$ python ~/Desktop/counter.py 
1
2
3
4
5
6
7
8
9
10


Initializing start & end...
start & end initialized...
returning self...
next is called...
1
next is called...
2
next is called...
3
next is called...
4
next is called...
5
next is called...
6
next is called...
7
next is called...
8
next is called...
9
next is called...
10
next is called...
"""