Most Pythonic Way to Build Dictionary From Single List

by

Use the .fromkeys() class method:

dayDict = dict.fromkeys(weekList, 0)

It builds a dictionary using the elements from the first argument (a sequence) as the keys, and the second argument (which defaults to None) as the value for all entries.

By it’s very nature, this method will reuse the value for all keys; don’t pass it a mutable value such as a list or dict and expect it to create separate copies of that mutable value for each key. In that case, use a dict comprehension instead:

dayDict = {d: [] for d in weekList}

More Related Contents:

  1. how do I make two dictionary keys with value as list [closed]
  2. I don’t know how to display step 3 for this assignment
  3. How to make a dict from n’th indices of tuples in list
  4. How do I initialize a dictionary of empty lists in Python?
  5. Access a particular field in arbitrarily nested JSON data [duplicate]
  6. How to return dictionary keys as a list in Python?
  7. Dictionary: Get list of values for list of keys
  8. In Python, when to use a Dictionary, List or Set?
  9. Create a list with initial capacity in Python
  10. How can I access the nested data in this complex JSON, which includes another JSON document as one of the strings?
  11. How can I initialize a dictionary of distinct empty lists in Python?
  12. List of tuples to dictionary [duplicate]
  13. How do I combine two lists into a dictionary in Python? [duplicate]
  14. Converting list of tuples into a dictionary
  15. [] and {} vs list() and dict(), which is better?
  16. Converting Dictionary to List? [duplicate]
  17. Appending a dictionary to a list in a loop
  18. Sorting a dictionary with lists as values, according to an element from the list
  19. How do I serialize a Python dictionary into a string, and then back to a dictionary?
  20. One liner: creating a dictionary from list with indices as keys
  21. Group by multiple keys and summarize/average values of a list of dictionaries
  22. Get a list of values from a list of dictionaries?
  23. How do I sort this list in Python, if my date is in a String?
  24. What are dict_keys, dict_items and dict_values?
  25. How do I send list of dictionary as Body parameter in FastAPI?
  26. How can I convert string values from a dictionary, into int/float datatypes?
  27. Python Accessing Values in A List of Dictionaries
  28. How do I send list of dictionary as Body parameter together with Files in FastAPI?
  29. How to convert only numbers in a mixed list into float
  30. In what case would I use a tuple as a dictionary key? [closed]

Leave a Comment