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

# #enumerate()
# 
# In this lecture we will learn about an extremely useful built-in function: enumerate(). Enumerate allows you to keep a count as you iterate through an object. It does this by returning a tuple in the form (count,element). The function itself is equivalent to:
# 
#     def enumerate(sequence, start=0):
#         n = start
#         for elem in sequence:
#             yield n, elem
#             n += 1
# 
# ##Example

# In[1]:


lst = ['a','b','c']

for number,item in enumerate(lst):
    print number
    print item


# enumerate() becomes particularly useful when you have a case where you need to have some sort of tracker. For example:

# In[3]:


for count,item in enumerate(lst):
    if count >= 2:
        break
    else:
        print item


# Great! You should now have a good understanding of enumerate and its potential use cases.