How can one make a dictionary with duplicate keys in Python?

by

Python dictionaries don’t support duplicate keys. One way around is to store lists or sets inside the dictionary.

One easy way to achieve this is by using defaultdict:

from collections import defaultdict

data_dict = defaultdict(list)

All you have to do is replace

data_dict[regNumber] = details

with

data_dict[regNumber].append(details)

and you’ll get a dictionary of lists.

More Related Contents:

  1. How to name a file using a value in a list in a dictionary?
  2. I am trying to modify a dictionary value using the exec function
  3. How to copy a dictionary and only edit the copy
  4. Python list of dictionaries search
  5. Replace values in a pandas series via dictionary efficiently
  6. Why is dictionary ordering non-deterministic?
  7. Object of custom type as dictionary key
  8. Get the key corresponding to the minimum value within a dictionary
  9. Error: ” ‘dict’ object has no attribute ‘iteritems’ “
  10. How does the key argument in python’s sorted function work?
  11. Merging dictionary value lists in python
  12. Convert a python dict to a string and back
  13. How can I use if/else in a dictionary comprehension?
  14. python groupby behaviour?
  15. sort dict by value python [duplicate]
  16. Recursively access dict via attributes as well as index access?
  17. Is there anything faster than dict()?
  18. Setting a value in a nested Python dictionary given a list of indices and value
  19. Add a new item to a dictionary in Python [duplicate]
  20. How to iterate through a list of dictionaries in Jinja template?
  21. Python: Reducing memory usage of dictionary
  22. Remove an item from a dictionary when its key is unknown
  23. PySpark create new column with mapping from a dict
  24. Is self.__dict__.update(**kwargs) good or poor style?
  25. How can I avoid “RuntimeError: dictionary changed size during iteration” error?
  26. Creating a dictionary with list of lists in Python
  27. dataframe to dict such that one column is the key and the other is the value [duplicate]
  28. Python Pickling Dictionary EOFError
  29. Python dictionary comprehension using locals() gives KeyError
  30. How do I re-map python dict keys

Leave a Comment