#!/usr/bin/env python
# coding: utf-8

# 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


# In[4]:


h = foo(5)


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

# In[5]:


next(g)


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

# In[6]:


g.next()


# In[7]:


next(g)


# 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)


# In[10]:


next(g)


# In[11]:


next(g)