Python 3.13 and TypeError: 'NoneType' object is not subscriptable on client startup

[ddimmich]

Hi,

Getting the following in the logs application startup with python 3.13.3:

Exception ignored in PyMapping_HasKeyString(); consider using PyMapping_HasKeyStringWithError(), PyMapping_GetOptionalItemString() or PyMapping_GetItemString():
Traceback (most recent call last):
File ".venv/lib/python3.13/site-packages/pylibmc/client.py", line 142, in init
super().init(servers=translate_server_specs(servers),

Looks like it gets ignored/is a warning, but might be an easy fix?

[peterthomassen]

This was fixed in d18ad29, but there has been no release since then.

@lericson Would you mind pushing a release to PyPI? (Any way to help with that?)

[lericson]

I'm open to help, I'm just very short on time. Want to be a maintainer, Peter? E-mail me at ludvig lericson se, insert special characters as appropriate- LudvigOn 16 Jun 2025, at 15:43, Peter Thomassen ***@***.***> wrote:peterthomassen left a comment (lericson/pylibmc#297) This was fixed in d18ad29, but there has been no release since then. @lericson Would you mind pushing a release to PyPI? (Any way to help with that?) —Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you were mentioned.Message ID: ***@***.***>

[ddimmich]

Hi - dropped you an email to the effect above - happy to try package it.

[mxamin]

@lericson I'm one of the maintainers of python-xmlsec and we recently released packages for Python 3.13. I would be happy to help here if you need it.

[timkofu]

Same issue:

Python 3.13.7 (main, Aug 16 2025, 12:52:22) [GCC 13.3.0]
Type 'copyright', 'credits' or 'license' for more information
IPython 9.5.0 -- An enhanced Interactive Python. Type '?' for help.
Tip: Put a ';' at the end of a line to suppress the printing of output.

In [1]: import pylibmc

In [2]: servers = ["127.0.0.1:11211"]
   ...: client = pylibmc.Client(servers)
Exception ignored in PyMapping_HasKeyString(); consider using PyMapping_HasKeyStringWithError(), PyMapping_GetOptionalItemString() or PyMapping_GetItemString():
Traceback (most recent call last):
  File "/app/.venv/lib/python3.13/site-packages/pylibmc/client.py", line 142, in __init__
    super().__init__(servers=translate_server_specs(servers),
TypeError: 'NoneType' object is not subscriptable

[zzzeek]

hey there -

im the dogpile.cache maintainer over here and I notice pylibmc is still kicking around with commits and people filing issues even though it hasn't had a release since 2022....and it still seems to run great too.

So I'm not the person who is going to do this, but putting it out there that releases can be reduced to pretty much zero effort as well as zero cost if you can get someone to help you write a cibuildwheel github action. Amazingly we live in a time when MSFT/github is providing server resources across literally every major architecture for free. Basically tagging for a new release kicks off the entire thing and within an hour you get dozens of binary builds pushed to pypi automatically. That would allow you to merge the occasional fix and then be able to release without any friction.

[kviktor]

There is already an action for that https://github.com/lericson/pylibmc/blob/master/.github/workflows/cd.yml

(tho the upload to PyPi part is commented out)