python tuple is immutable – so why can I add elements to it

by

5 is immutable, too. When you have an immutable data structure, a += b is equivalent to a = a + b, so a new number, tuple or whatever is created.

When doing this with mutable structures, the structure is changed.

Example:

>>> tup = (1, 2, 3)
>>> id(tup)
140153476307856
>>> tup += (4, 5)
>>> id(tup)
140153479825840

See how the id changed? That means it’s a different object.

Now with a list, which is mutable:

>>> lst = [1, 2, 3]
>>> id(lst)
140153476247704
>>> lst += [4, 5]
>>> id(lst)
140153476247704

The id says the same.

More Related Contents:

  1. Why can tuples contain mutable items?
  2. a mutable type inside an immutable container
  3. Why are python strings and tuples are made immutable?
  4. Does Python have an immutable list?
  5. What’s the difference between lists and tuples?
  6. How does tuple comparison work in Python?
  7. How does swapping of members in tuples (a,b)=(b,a) work internally?
  8. What would a “frozen dict” be?
  9. Ignore python multiple return value
  10. List vs tuple, when to use each? [duplicate]
  11. How to change values in a tuple?
  12. When are parentheses required around a tuple?
  13. Sort tuples based on second parameter
  14. Add Variables to Tuple
  15. Getting one value from a tuple
  16. Python string with space and without space at the end and immutability
  17. What’s the difference between lists enclosed by square brackets and parentheses in Python?
  18. Convert a columns of string to list in pandas
  19. lambda arguments unpack error
  20. Python Class __div__ issue
  21. Python lambda does not accept tuple argument [duplicate]
  22. Swap values in a tuple/list inside a list in python?
  23. Pandas: Modify a particular level of Multiindex
  24. Unexpected Behavior of Extend with a list in Python [duplicate]
  25. How does str.startswith really work?
  26. How to use ast.literal_eval in a pandas dataframe and handle exceptions
  27. If in Python I put a list inside a tuple, can I safely change the contents of that list? [duplicate]
  28. Mutable and Immutable Strings in python
  29. Why must dictionary keys be immutable?
  30. Converting string to tuple without splitting characters

Leave a Comment