UP031: fix for "%.2X" % 1 generates broken code

[radoering]

I know fixing UP031 is unsafe, but in this case we can do better:

"%.2X" % 1 is converted to "{:.2X}".format(1) but should probably be converted to "{:02X}".format(1)

>>> "%.2X" % 1
'01'
>>> "%02X" % 1
'01'
>>> "{:02X}".format(1)
'01'
>>> "{:.2X}".format(1)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: Precision not allowed in integer format specifier

Command: ruff check --select UP031 --fix --unsafe-fixes test.py
Ruff Version: 0.5.3

[charliermarsh]

Agreed.

[charliermarsh]

So basically: use :0 rather than . for integer-only presentation types.