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Avoiding boilerplate by using immutable default arguments (vulwsztyn.codeberg.page)
submitted 1 month 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 month ago

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 month ago* (last edited 1 month 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.

this post was submitted on 22 Jul 2025
17 points (100.0% liked)

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