Personally, I would want bpython to add the '.py' to the filename when I save a file. Adding the following lines in the write2file method in repl.py:

#!python

if not fn.endswith('.py')
    fn += '.py'

works for me, I don't know if that would cause any adverse reactions in other situations.
I've also changed the line:

#!python

f = open(fn, 'w')

in the same method to:

#!python

f = open(fn, 'a')

so that a file is not overwritten when saving to it, it is merely appended to.

These would probably be better suited as options rather than the default behavior, but I think it's useful functionality nonetheless.

• Bitbucket: https://bitbucket.org/bobf/bpython/issue/239
• Originally Reported By: Dan Seminara
• Originally Created At: 2013-03-08T23:54:09.432