tjreedy at udel.edu
Wed Oct 1 19:52:57 CEST 2014
On 10/1/2014 10:47 AM, Steven D'Aprano wrote:
> Inside the interactive interpreter, I can restart the interpreter with four
> - Ctrl-D
> - UP-ARROW
> - ENTER
> Ctrl-D exits Python and returns me to the shell, UP-ARROW fetches the
> previous command ("python"), and ENTER runs that command. On Windows, I
> *think* you have to type Ctrl-Z ENTER instead of Ctrl-D, so that will be
> five keystrokes.
For the console interpreter, this is still true even in 3.5.0a0
File "<stdin>", line 1
SyntaxError: invalid syntax
Idle now quits on ^D on all systems. ^Z (unlike other control chars) is
rejected with an immediate error beep.
Either way, restart is a single click if one have the console or Idle
interpreter icon pinned on the task bar.
Even this is unnecessary with Idle as it has a Restart Shell command on
the Shell menu (hotkey ^F6). (This is automatically invoked when
running an edited file (F5)).
Some problems with restarting are unwinding the call stack, undoing
what has been done, and doing something else so as to not run into the
same problem. We can view every raise -- except pair as a partial
restart of some sort. A minimal startup script something like the
following allows a nearly global restart that addresses all three
problems listed above.
from appmain import main, cleanup, RestartError
restart = False
except RestartError as err:
restart = err
The main and cleanup functions, switching on the restart arg, and
possibly the class RestartError depend on the app.
Terry Jan Reedy
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