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In [1]:

    
from __future__ import print_function



In [2]:

    
def foo(n):
    for i in range(n):
        yield i*i



In [3]:

    
g = foo(4)
g









    Out[3]:





<generator object foo at 0xb28ec3c4>



In [4]:

    
h = foo(5)

The next() builtin function for iterators is available in both Python 2 and 3.



In [5]:

    
next(g)









    Out[5]:





0

The .next() method for iterators is available only in Python 2.



In [6]:

    
g.next()









    



---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-6-d7e53364a9a7> in <module>()
----> 1 g.next()

AttributeError: 'generator' object has no attribute 'next'



In [7]:

    
next(g)









    Out[7]:





1

The h and g generators are independent of each other. So iterating through h does not iterfere with g.



In [8]:

    
for i in h:
    print(i)



In [9]:

    
next(g)









    Out[9]:





4



In [10]:

    
next(g)









    Out[10]:





9



In [11]:

    
next(g)









    



---------------------------------------------------------------------------
StopIteration                             Traceback (most recent call last)
<ipython-input-11-5f315c5de15b> in <module>()
----> 1 next(g)

StopIteration: