Terry J. Reedy <[email protected]> added the comment:
Pablo, unless you are suggesting rewriting IDLE's custom exception handing in
C, I don't see how making it a single function would be an improvement. As
long as it is Python code, the problem is accessing the message supplement.
After reading your comment, I agree that injecting Python code into the C
exception handling is a bad idea. It also, I see now, not needed
run.print_exception first calls traceback.extract_tb (line 238). The doc says
" It is useful for alternate formatting of stack traces", which IDLE does.
print_exception next calls the undocumented traceback.print_list, which is
format_list + print*. Finally, print_exception calls
traceback.format_exception_only (line 2440), which returns a list of lines that
is immediately printed.
So all IDLE needs is for format_exception_only to include the extra lines,
either by default or by option. But it just calls
TracebackException.format_exception)only, which call a private Python-coded
function, which can only add the lines if accessible from Python-code.
Dennis cleverly pointed out that such access is available, even if awkwardly,
by capturing the standard excepthook outout and keeping only the missing part.
(test.support.captured_stderr just wraps io.StringIO as a context manager.
IDLE can borrow and edits its code.)
Dennis, would you like to prepare a PR that follows the format_exception_only
call with something like
if isinstance(typ, (AttributeError, NameError)):
lines.extend(extract_extra_message(<args>))
and a definition of the new function? (and a new test)? Or perhaps better,
replace format_exception_only with a function that gets all lines at once.
Pablo, do any other exception types have such omitted help info? Do you have
plans for any more?
----------
title: IDLE doesn't offer "Did you mean?" for AttributeError and NameError ->
IDLE: print "Did you mean?" for AttributeError and NameError
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<https://bugs.python.org/issue44026>
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