s5.py

#dictionary
a={'a':1,'b':2,'c':3}
#Converting dictionary(iterable) into iterator object using iter() function.
b=iter(a)
print (b)#Output:<dict_keyiterator object at 0x005F3BE0>
print (type(b))#Output:<class 'dict_keyiterator'>


#Applying next() over the iterator.
#Returns one element(key) at a time.
#loops over the keys in the dictionary
print (next(b))#Output:a
print (next(b))#Output:b