SyntaxWarning when using Python 3.12+ - vendor/memcache/memcache.py

[Priiam]

Environment

• OS Rocky Linux 9.3
• Rez version 3.3.0
• Rez python version 3.13.11

To Reproduce

1. Build Rez v3.3.0 from source with Python 3.13.11
2. Run rez -h

Expected behavior
The command should display the help message with no clutter.

$> rez -h
usage: rez [-h] [-i] [-V] [-v] COMMAND ...

[...]

Actual behavior
The command first displays a SyntaxtWarning, then prints out the help message.

$> rez -h
/software/rez/3.3.0/lib/python3.13/site-packages/rez/vendor/memcache/memcache.py:130: SyntaxWarning: invalid escape sequence '\ '
  debuglog,\ set, set_multi, add, replace, get, get_multi,

usage: rez [-h] [-i] [-V] [-v] COMMAND ...

[...]

The offending character appears to be this backward slash:

https://github.com/AcademySoftwareFoundation/rez/blame/e278f251f0d9843297d04859e81e88746068e990/src/rez/vendor/memcache/memcache.py#L130

Regression
I did not experience this bug in Rez v3.2.0 and Python 3.11.10 - Even though the offending character is present. This is likely due to Python3.12+ now reporting these syntax issues as SyntaxWarning instead of DeprecationWarning. I suspect the old-style DeprecationWarnings were being silenced.

[maxnbk]

We’ll be migrating memcached libraries soon, so this shouldn’t be a problem for long anyway.

…

On Fri, Jan 2, 2026 at 8:22 PM Priam Sampaio ***@***.***> wrote: *Priiam* created an issue (AcademySoftwareFoundation/rez#2061) <#2061> *Environment* - OS Rocky Linux 9.3 - Rez version 3.3.0 - Rez python version 3.13.11 *To Reproduce* 1. Build Rez v3.3.0 from source with Python 3.13.11 2. Run rez -h *Expected behavior* The command should display the help message with no clutter. $> rez -h usage: rez [-h] [-i] [-V] [-v] COMMAND ... [...] *Actual behavior* The command first displays a SyntaxtWarning, then prints out the help message. $> rez -h /software/rez/3.3.0/lib/python3.13/site-packages/rez/vendor/memcache/memcache.py:130: SyntaxWarning: invalid escape sequence '\ ' debuglog,\ set, set_multi, add, replace, get, get_multi, usage: rez [-h] [-i] [-V] [-v] COMMAND ... [...] The offending character appears to be this backward slash: https://github.com/AcademySoftwareFoundation/rez/blame/e278f251f0d9843297d04859e81e88746068e990/src/rez/vendor/memcache/memcache.py#L130 *Regression* I did not experience this bug in Rez v3.2.0 and Python 3.11.10 - Even though the offending character is present. This is likely due to Python3.12+ now reporting these syntax issues as SyntaxWarning instead of DeprecationWarning. I suspect the old-style DeprecationWarnings were being silenced. — Reply to this email directly, view it on GitHub <#2061>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABPOE3VCAYCSJCU3GSH6EBD4E4KURAVCNFSM6AAAAACQSBXE5SVHI2DSMVQWIX3LMV43ASLTON2WKOZTG43TONJTHA4TANI> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>