#318: helper.py, 'import collections'
#318: helper.py, initial 'duplicate_list_index' method
#318: helper.py, define 'duplicate_list_index' method
#318: helper.py, add docblock for 'duplicate_list_index'
#318: helper.py, minor comment change
#318: helper.py, add minor comment
#318: helper.py, change 'duplicates' -> 'dic_elements'
#318: helper.py, move 'dic_elements' under comment
#318: helper.py, add minor comments
#318: helper.py, remove 'non-duplicated' elements from 'dic'
#318: helper.py, remove 38d36b6 using '<='
#318: helper.py, change 'dic_elements' -> 'dic_duplicates'
#318: helper.py, return 'dic_duplicates' not 'duplicates'
#318: helper.py, minor comment change
#318: helper.py, minor comment change
Merge pull request #319 from jeff1evesque/python_helper

#318: 'helper.py', Find index of item with duplicates