Replacing PyMapping_HasKeyString with PyMapping_HasKeyStringWithError results in:

>>> import pylibmc
>>> m = pylibmc.Client(["10.0.0.1"], binary=True)
Traceback (most recent call last):
  File "<python-input-1>", line 1, in <module>
    m = pylibmc.Client(["10.0.0.1"], binary=True)
  File "/usr/lib64/python3.13/site-packages/pylibmc/client.py", line 142, in __init__
    super().__init__(servers=translate_server_specs(servers),
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                     binary=binary,
                     ^^^^^^^^^^^^^^
                     username=username, password=password,
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                     behaviors=_behaviors_numeric(behaviors))
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: 'NoneType' object is not subscriptable

-------------


My assumption is this:

>>> pylibmc.client._behaviors_numeric(None) is None
True

When behaviors is None (the default), it passes None to _pylibmc.client behaviors.

Without it, it works:

>>> _pylibmc.client(servers=pylibmc.client.translate_server_specs(["10.0.0.1"]))
<client object at 0x7f0874a59970>

But setting it to None fails:

>>> _pylibmc.client(servers=pylibmc.client.translate_server_specs(["10.0.0.1"]), behaviors=None)
Traceback (most recent call last):
  File "<python-input-7>", line 1, in <module>
    _pylibmc.client(servers=pylibmc.client.translate_server_specs(["10.0.0.1"]), behaviors=None)
    ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: 'NoneType' object is not subscriptable


Previously, the error resulted in treating the result as if the key was not in the dict.

Hence, this should fix this:



diff --git a/src/_pylibmcmodule.c b/src/_pylibmcmodule.c
index a34d2b5..545b658 100644
--- a/src/_pylibmcmodule.c
+++ b/src/_pylibmcmodule.c
@@ -2082,7 +2082,7 @@ static PyObject *PylibMC_Client_set_behaviors(PylibMC_Client *self,
     char *key;
 
     for (b = PylibMC_behaviors; b->name != NULL; b++) {
-        if (!PyMapping_HasKeyString(behaviors, b->name)) {
+        if (behaviors == Py_None || !PyMapping_HasKeyString(behaviors, b->name)) {
             continue;
         } else if ((py_v = PyMapping_GetItemString(behaviors, b->name)) == NULL) {
             goto error;
@@ -2112,7 +2112,7 @@ static PyObject *PylibMC_Client_set_behaviors(PylibMC_Client *self,
     }
 
     for (b = PylibMC_callbacks; b->name != NULL; b++) {
-        if (!PyMapping_HasKeyString(behaviors, b->name)) {
+        if (behaviors == Py_None || !PyMapping_HasKeyString(behaviors, b->name)) {
             continue;
         } else if ((py_v = PyMapping_GetItemString(behaviors, b->name)) == NULL) {
             goto error;


Indeed:


>>> import pylibmc
>>> m = pylibmc.Client(["10.0.0.1"], binary=True)
>>>

I belive this should fix it: https://github.com/lericson/pylibmc/pull/292

FEDORA-2024-9ec2b42d96 (python-pylibmc-1.6.3-9.fc41) has been submitted as an update to Fedora 41.
https://bodhi.fedoraproject.org/updates/FEDORA-2024-9ec2b42d96

FEDORA-2024-9ec2b42d96 (python-pylibmc-1.6.3-9.fc41) has been pushed to the Fedora 41 stable repository.
If problem still persists, please make note of it in this bug report.