Patches item #1654974, was opened at 2007-02-08 09:46
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Category: Library (Lib)
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Nefarious CodeMonkey, Jr. (nejucomo)
Assigned to: Nobody/Anonymous (nobody)
Summary: sys.excepthook shows relevant bindings.
Initial Comment:
The attached module provides a suitable replacement for sys.excepthook to
handle uncaught exceptions.
The output is the same, except after each source line shown, a list of relevant
bindings is shown.
Here's a quick example from the tail end of a test:
File "./test-exprann.py", line 16, in f
assert c == 12
# With bindings:
# c = 42
AssertionError
The bindings shown are the intersection of the code object "co_names" and the
non-keyword name tokens in the parsed source line. The goal is to only show
bindings relevant to the exception.
I hope the utility of this is self-evident to any programmer. I tried testing
it with crazy expressions containing nonfree bindings (such as lambda's and
list comprehensions), so I think it behaves well in most circumstances.
The performance might be bad (it parses each line in the backtrace), but I
figure it is worth it for uncaught exceptions.
Let me know if you find this tool useful.
Thanks,
Nejucomo
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