What’s the most Pythonic way to identify consecutive duplicates in a list?

by 
>>> from itertools import groupby
>>> L = [0, 0, 0, 3, 3, 2, 5, 2, 6, 6]
>>> grouped_L = [(k, sum(1 for i in g)) for k,g in groupby(L)]
>>> # Or (k, len(list(g))), but that creates an intermediate list
>>> grouped_L
[(0, 3), (3, 2), (2, 1), (5, 1), (2, 1), (6, 2)]

Batteries included, as they say.

Suggestion for using sum and generator expression from JBernardo; see comment.

More Related Contents:

  1. How do you remove duplicates from a list whilst preserving order?
  2. Removing duplicates in lists
  3. How do I find the duplicates in a list and create another list with them?
  4. Removing elements that have consecutive duplicates
  5. Concatenating two lists – difference between ‘+=’ and extend()
  6. Test if lists share any items in python
  7. How to take the first N items from a generator or list? [duplicate]
  8. How do I check if there are duplicates in a flat list?
  9. Pythonic way to return list of every nth item in a larger list
  10. How to check if all of the following items are in a list?
  11. How do I remove duplicates from a list, while preserving order?
  12. TypeError: unhashable type: ‘list’ when using built-in set function
  13. How to generate all the permutations of elements in a list one at a time in Lisp?
  14. Scala: Remove duplicates in list of objects
  15. How to get the n next values of a generator in a list (python)
  16. Remove duplicates and original from list
  17. How can I find same values in a list and group together a new list?
  18. Duplicate each member in a list [duplicate]
  19. Extract list of attributes from list of objects in python
  20. Python: Remove Duplicate Items from Nested list
  21. Python: Rename duplicates in list with progressive numbers without sorting list
  22. Iterate over pairs in a list (circular fashion) in Python
  23. Python: find a list within members of another list(in order)
  24. python remove duplicates from 2 lists
  25. Pythonic way to convert a list of integers into a string of comma-separated ranges
  26. Slicing a list into a list of sub-lists [duplicate]
  27. Iterating over every two elements in a list [duplicate]
  28. Print LIST of unicode chars without escape characters
  29. Filtering a list based on a list of booleans
  30. Creating an empty list in Python

Leave a Comment