22.iterator.py

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'''
Topics
'''
'''
for loop using iter and next at backgournd to run this loop
'''
listval = ['a','b','c','d']
for i in listval:
    print('i => ',i)

# Python Iterators: __iter__() and __next__()
iterval = iter(listval)
print('\n\nUsing iterval')
print(next(iterval))
print(next(iterval))
print(next(iterval))
print(next(iterval))
# print(next(iterval))

# Iterator vs Iterable

# Looping Through an Iterator
# Create an Iterator
class Number:
    def __iter__(self):
        self.a = 1
        return self

    def __next__(self):
        if self.a <= 10:
            n = self.a
            self.a += 1
            return n
        else:
            raise StopIteration

nextnum = Number()
mynum = iter(nextnum)

# print(next(mynum))
for i in mynum:
    print(i)

# StopIteration

'''
Exc:

1. aap ek loop creat karo useing iter and next.
'''