s17.py

def gen(n):
    for i in range(n):
        yield i

g=gen(3)
print (type(g))#Output:<class 'generator'>
#Generator function returns an iterator.
# We can access the element by using next() function or using for loop.
print (next(g))#Output:0
print (next(g))#Output:1
print (next(g))#Output:2