Inspect object has no attribute date_format

[linville]

Inspecting a Chapter 10 file for just messages of type 0x30 errors out attempting to access a non-existent date_format attribute of the inspect object.

% pdm run c10 inspect path/to/file.c10 -t 0x30
-----------------------------------------------------------------------------------------------
| Channel | Type | Sequence | Size    | Time                        | Valid | Offset          |
-----------------------------------------------------------------------------------------------
'Inspect' object has no attribute 'date_format' at 0
'Inspect' object has no attribute 'date_format' at 336
... [snip] ...

Appears to be an issue with the following line:

c10-tools/c10_tools/inspect.py

Line 75 in c49dd02

if self.date_format:

I've worked around it by modifying that line to use getattr(..) to access the attribute (but wasn't quite confident if that was the fix or if it should just be initialized in __init__).

Reproduceable with Python 3.9 and 3.10.

[mcferrill]

That looks reasonable. Are you able to submit a pull request to that effect? Bonus points for tests.

[linville]

Submitted getattr change w/ test that checks inspect filtering expected output.

Probably out of scope for this PR, but I had to bump Pytest to a newer version to get this fix to test with Python 3.10.

[mcferrill]

Looks great! Let's get this merged!

I'll make a note to review dependencies and pick up that pytest update. Thanks for calling that out.