New submission from Terry J. Reedy:
With one process (installed 2.7.10, -n option):
>>> raise
Traceback (most recent call last):
File "<pyshell#0>", line 2, in <module>
TypeError: exceptions must be old-style classes or derived from BaseException,
not NoneType
With subprocess (default option):
>>> raise
Traceback (most recent call last):
** IDLE Internal Exception:
File "C:\Programs\Python27\lib\idlelib\run.py", line 325, in runcode
exec code in self.locals
File "C:\Programs\Python27\lib\idlelib\run.py", line 111, in main
seq, request = rpc.request_queue.get(block=True, timeout=0.05)
File "C:\Programs\Python27\lib\Queue.py", line 176, in get
raise Empty
Empty
The 2.7.10 says " If no exception is active in the current scope, a TypeError
exception is raised indicating that this is an error (if running under IDLE, a
Queue.Empty exception is raised instead)." The comment is not true with -n.
But adding changing 'IDLE' to 'IDLE without -n' might encourage people to think
that they should use '-n'.
A workaround fix might be to add a special check to the internal error handling
code to print the TypeError instead. I do not know of any other open issues
about Internal Exceptions being printed.
This is a low priority issue, but it is peculiar that this seems to be the only
exception so mangled. The only issue issue I found related to this section of
the Idle code is #1190163.
This is a 2.7 issue only. In 3.4+, console or Idle in either mode:
>>> raise
Traceback (most recent call last):
File "<pyshell#0>", line 1, in <module>
raise
RuntimeError: No active exception to reraise
----------
messages: 249137
nosy: terry.reedy
priority: low
severity: normal
stage: needs patch
status: open
title: Idle: handle 'raise' properly when running with subprocess (2.7)
type: behavior
versions: Python 2.7
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue24936>
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