Comment 3 for bug 1008841

bpython seems not to run from inside Emacs at all - changing this seems out of scope.

Citing a workaround from here:

http://emacs.stackexchange.com/questions/6012/is-it-possible-to-transform-emacs-to-something-like-bpython

You may also be interested in bpython-curtsies along with the new "send session to editor" functionality (triggered by F7) which throws your entire session in emacs for modification, then re-executes it when you close the file. I like this workflow for combining the power of a text editor with the interactive features of bpython. You might also like "reimport," (F6) which reruns the entire bpython session including reimporting imported modules - another way to combine text editor and the REPL.