In [1]:

    

def foo(n):
    for i in range(n):
        yield f'twice {i} is {2*i}'


    

In [2]:

    

g = foo(3)
g


    

    
Out[2]:





<generator object foo at 0x7f9dac352eb8>

In [3]:

    

next(g)


    

    
Out[3]:





'twice 0 is 0'

In [4]:

    

next(g)


    

    
Out[4]:





'twice 1 is 2'

In [5]:

    

next(g)


    

    
Out[5]:





'twice 2 is 4'

In [6]:

    

next(g)


    

    




---------------------------------------------------------------------------
StopIteration                             Traceback (most recent call last)
<ipython-input-6-5f315c5de15b> in <module>()
----> 1 next(g)

StopIteration: 

In [7]:

    

next(foo(5))


    

    
Out[7]:





'twice 0 is 0'

In [8]:

    

next(foo(5))


    

    
Out[8]:





'twice 0 is 0'

In [9]:

    

for x in foo(5):
    print(x)


    

    




twice 0 is 0
twice 1 is 2
twice 2 is 4
twice 3 is 6
twice 4 is 8