Why does appending to one list also append to all other lists in my list of lists? [duplicate]

by

[[]]*2 is a list of two references to the same list. You are appending to it and then seeing it twice.

More Related Contents:

  1. How to make a dict from n’th indices of tuples in list
  2. Why does this code for initializing a list of lists apparently link the lists together? [duplicate]
  3. Python list doesn’t reflect variable change
  4. Why is [] faster than list()?
  5. How can I multiply all items in a list together with Python?
  6. Remove trailing newline from the elements of a string list
  7. How to loop through all but the last item of a list?
  8. Writing a list to a file with Python, with newlines
  9. How can I convert each item in the list to string, for the purpose of joining them? [duplicate]
  10. How can I initialize a dictionary of distinct empty lists in Python?
  11. Take the content of a list and append it to another list
  12. Modifying a list inside a function
  13. Python: How to remove empty lists from a list? [duplicate]
  14. How to get the n next values of a generator in a list (python)
  15. Merging/adding lists in Python
  16. How do I sort this list in Python, if my date is in a String?
  17. Convert all strings in a list to integers
  18. “TypeError: ‘type’ object is not subscriptable” in a function signature
  19. How can I convert string values from a dictionary, into int/float datatypes?
  20. python – get list of tuples first index?
  21. Python: Elegant and efficient ways to mask a list
  22. Optimal method to find the max of sublist items within list
  23. Find a value in a list [duplicate]
  24. How do I send list of dictionary as Body parameter together with Files in FastAPI?
  25. Creating a list in Python- something sneaky going on?
  26. Rearranging list based on order of another list
  27. list comprehension with multiple conditions (python)
  28. How to convert only numbers in a mixed list into float
  29. In what case would I use a tuple as a dictionary key? [closed]
  30. deque.popleft() and list.pop(0). Is there performance difference?

Leave a Comment