Python Iterators

my_iterable_value = 'pyton tutorial'
my_iterable_obj = iter(my_iterable_value)

while True:
    try:

        # Iterate by calling next
        item = next(my_iterable_obj)
        print(item)
    except StopIteration:

        break

class Test:

    # Constructor
    def __init__(self, limit):
      self.limit = limit

    # Creates iterator object
    # Called when iteration is initialized
    def __iter__(self):
      self.x = 104
      return self

    # To move to next element. In Python 3,
    # we should replace next with __next__
    def __next__(self):

      # Store current value ofx
      x = self.x

      # Stop iteration if limit is reached
      if x > self.limit:
        raise StopIteration

      # Else increment and return old value
      self.x = x + 1;
      return x

# Print numbers from 104 to 112
for i in Test(112):
    print(i)

# Print nothing
for i in Test(103):
    print(i)

# Python iterating over list
print("Python List Iteration")
l = ["agernic", "python", "tutorial"]

for i in l:
    print(i)

# Python iterating over tuple (immutable)
print("\nPython Tuple Iteration")
t = ("agernic", "python", "tutorial")
for i in t:
    print(i)

# Python iterating over String
print("\nPython String Iteration")
s = "Tutorial"
for i in s :
    print(i)

# Python iterating over dictionary
print("\nPython Dictionary Iteration")
d = dict()
d['xyz'] = 468
d['abc'] = 215
for i in d :
    print("%s %d" %(i, d[i]))