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Avoiding boilerplate by using immutable default arguments (vulwsztyn.codeberg.page)

submitted 1 week ago by Vulwsztyn@programming.dev to c/python@programming.dev

8 comments fedilink hide all child comments

Hi, I recently realised one can use immutable default arguments to avoid a chain of:

def append_to(element, to=None):
    if to is None:
        to = []

at the beginning of each function with default argument for set, list, or dict.

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[–] Narann@jlai.lu 2 points 1 week ago (1 children)

Does not seems to work on 3.12:

Python 3.12.11 (main, Jun 29 2025, 16:18:35) [MSC v.1944 64 bit (AMD64)] on win32
>>> def toto(tata=>[]):
  File "<stdin>", line 1
    def toto(tata=>[]):
                  ^
SyntaxError: invalid syntax

[–] logging_strict@programming.dev 1 points 1 week ago* (last edited 1 week ago)

Upvote for the sanity check.

As the OP mentioned, this is a proposed/draft feature that may or may not ever happen.

With these kinda posts, should start a betting pool. To put money down on whether this feature sees the light of day within an agreed upon fixed time frame.