Merge pull request #1 from abinashpanda/abinash_dev

Lambda Functions added
Iterators and itertools
Merge branch 'master' of https://github.com/ankurankan/python_workshop
Merge pull request #2 from abinashpanda/abinash_dev

Collections Defaultdict
Merge pull request #3 from abinashpanda/abinash_dev

Collections NamedTuple
Generators
Merge branch 'master' of https://github.com/ankurankan/python_workshop
deque
Changes in Deque notebook