percentage signs can't be logged in structlog==22.2.0

[danielx]

Hello, it seems the new 22.2.0 release breaks structlog if events/messages contains the % character.

$ pip freeze | grep structlog
structlog==22.2.0

---

# main.py
import structlog

log = structlog.get_logger()

log.info("example.com/?q=Hello%2C%20World%21")

$ python main.py
Traceback (most recent call last):
  File "/home/daniel/work/structerr/main.py", line 5, in <module>
    log.info("example.com/?q=Hello%2C%20World%21")
  File "/home/daniel/.local/share/virtualenvs/structerr-1KsXSVL2/lib/python3.10/site-packages/structlog/_log_levels.py", line 156, in meth
    return self._proxy_to_logger(name, event % args, **kw)
TypeError: not enough arguments for format string

---

# main.py
import structlog

log = structlog.get_logger()

log.info("50%")

$ python main.py
Traceback (most recent call last):
  File "/home/daniel/work/structerr/main.py", line 6, in <module>
    log.info("50%")
  File "/home/daniel/.local/share/virtualenvs/structerr-1KsXSVL2/lib/python3.10/site-packages/structlog/_log_levels.py", line 156, in meth
    return self._proxy_to_logger(name, event % args, **kw)
ValueError: incomplete format

[danielx]

It looks like this issue will also be fixed by #475

[hynek]

Great, thanks for finding it and sorry!

[hynek]

JFTR I've added fc60f2f to ensure it keeps working.

[danielx]

No problem, thanks for building structlog!

[hynek]

22.3 is on PyPI