Getting the difference (delta) between two lists of dictionaries

by

How about this:

>>> [x for x in data2 if x not in data1]
[{'name': u'String 3'}]

Edit:

If you need symmetric difference you can use :

>>> [x for x in data1 + data2 if x not in data1 or x not in data2]

or 

>>> [x for x in data1 if x not in data2] + [y for y in data2 if y not in data1]

One more edit

You can also use sets:

>>> from functools import reduce
>>> s1 = set(reduce(lambda x, y: x + y, [x.items() for x in data1]))
>>> s2 = set(reduce(lambda x, y: x + y, [x.items() for x in data2]))

>>> s2.difference(s1)
>>> s2.symmetric_difference(s1)

More Related Contents:

  1. How do I convert two lists into a dictionary?
  2. Convert [key1,val1,key2,val2] to a dict?
  3. Why can’t I use a list as a dict key in python?
  4. Remove duplicate dict in list in Python
  5. How can I get list of values from dict?
  6. Getting a list of values from a list of dicts
  7. list to dictionary conversion with multiple values per key?
  8. How to overcome TypeError: unhashable type: ‘list’
  9. Creating a list of dictionaries results in a list of copies of the same dictionary
  10. List of dicts to/from dict of lists
  11. How can I make a dictionary from separate lists of keys and values?
  12. Appending a dictionary to a list – I see a pointer like behavior
  13. How to convert list of key-value tuples into dictionary?
  14. Check if value already exists within list of dictionaries?
  15. Convert list into a dictionary [duplicate]
  16. Combining Dictionaries Of Lists In Python
  17. Most Pythonic Way to Build Dictionary From Single List
  18. Python: get a dict from a list based on something inside the dict
  19. Make dictionary from list with python [duplicate]
  20. Get a list of values from a list of dictionaries?
  21. Remove dictionary from list
  22. how to convert list of dict to dict
  23. How do I extract all the values of a specific key from a list of dictionaries?
  24. How do I return dictionary keys as a list in Python?
  25. Why can’t I use a list as a dict key in python? Exactly what can and cannot be used, and why?
  26. convert csv file to list of dictionaries
  27. Python: iterating over list vs over dict items efficiency
  28. Mapping dictionary value to list
  29. How to extract all values from a dictionary in Python?
  30. Comparing 2 lists consisting of dictionaries with unique keys in python

Leave a Comment