PythonLearning/47.IteratorsInPython.py at Pythontuts · aditya0035/PythonLearning · GitHub

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"""

Iterators are those which will implement __next__ method then any object can call next on them

"""

class FirstHundreadNumber:

def __init__(self):

self.number=0

def __next__(self):

if self.number<=100:

current=self.number

self.number=self.number+1

return current

else:

"""

These will raise stop iteration to stop the iteration once completed

"""

raise StopIteration() #it tell the python that we have reach the end of generator

instance=FirstHundreadNumber()

print(next(instance))

"""

These class will behave like generator but are iterator and call be called only via next method

Not all the iterators are generators

"""

#lst=list(instance) #does not work as not iterable

#print(list)

"""

in python 2 we create iterators using next method implementation

"""

Also we can't call for each on iterators

"""

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