Terry J. Reedy added the comment:
Duplicate #28581 has a autosave patch in the initial post, which points out
that "We are often required to copy code from various sites say some tutorial
or code samples which are good for one time usage."
It prompted me to think more about the idea to 'add a mechanism to truly run
without saving [to disk]', which I mentioned in my first post above. To run
editor code, IDLE retrieves the code from the Text widget as a single strings;
runs compile(code, 'filename', 'exec'), ships the code object to the user
process, and runs exec(code, fakemain). (I understand this much better now
than 3 years ago.) The only use of the disk copy is for tracebacks. But is it
*needed*? I believe not. Here is standard interactive Python (3.5.2):
>>> def f():
1/0
>>> f()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<stdin>", line 2, in f
ZeroDivisionError: division by zero
>>>
Here is the same traceback in IDLE's Shell:
Traceback (most recent call last):
File "<pyshell#40>", line 1, in <module>
f()
File "<pyshell#39>", line 2, in f
1/0
ZeroDivisionError: division by zero
IDLE has filled in the missing lines from Shell's text. I have not yet tracked
where this is done (in pyshell.py, I believe), but I presume it could do the
same for Untitled editor windows. For this to work, the window titles should
be Untitled-0, Untitled-1, ... . The specific name used in the compile call
would appear in the traceback, to be used to lookup the window the code came
from.
With the ability to run the whole buffer without saving, it would be easy to
run a selection. (There have been multiple requests for this.)
IDLE already asks about saving when one tried to close a window with unsaved
text, so there is no need to force saving when running for this purpose.
----------
versions: +Python 3.6, Python 3.7 -Python 2.7, Python 3.3, Python 3.4
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<http://bugs.python.org/issue19042>
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