[issue24936] Idle: handle 'raise' properly when running with subprocess (2.7)

[Terry J. Reedy]

Terry J. Reedy added the comment:

The Runtime error is what current py 3 raises.  TypeError is what 2.7.13 
raises. Since the only problem is for someone who read the doc running 'raise' 
in IDLE 2.7  in -n mode, closing.

--
assignee:  -> terry.reedy
components: +IDLE
resolution:  -> wont fix
stage: needs patch -> resolved
status: open -> closed

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[issue24936] Idle: handle 'raise' properly when running with subprocess (2.7)

[Terry J. Reedy]

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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