From emacs -Q:
(setq python-shell-interpreter "ipython"
python-shell-interpreter-args "-i")
M-x run-python
In the python comint buffer insert "from itertools imp" and hit tab.
You will see "imp" completed as "import" (no trailing space).
However, if you do this in ipython itself, you will see "imp" completed
as "import ". This (i.e. what ipython does) is the desired behavior
(because import is always followed by another word).
In GNU Emacs 25.1.50.1 (x86_64-apple-darwin14.5.0, NS appkit-1348.17 Version 10.10.5 (Build 14F27))
of 2016-04-16 built on hemiprocne
Repository revision: 934549e23d6bda5231375dbfed7b42a966c85d14
Windowing system distributor 'Apple', version 10.3.1348
Configured using:
'configure --prefix=/usr/local/Cellar/emacs/HEAD
--enable-locallisppath=/usr/local/share/emacs/site-lisp
--infodir=/usr/local/Cellar/emacs/HEAD/share/info/emacs --with-xml2
--without-dbus --without-gnutls --with-ns --disable-ns-self-contained'
Configured features:
JPEG NOTIFY ACL LIBXML2 ZLIB TOOLKIT_SCROLL_BARS NS
Important settings:
value of $LANG: en_US.UTF-8
locale-coding-system: utf-8-unix
Major mode: Lisp Interaction
Minor modes in effect:
tooltip-mode: t
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electric-indent-mode: t
mouse-wheel-mode: t
tool-bar-mode: t
menu-bar-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
font-lock-mode: t
blink-cursor-mode: t
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t
line-number-mode: t
transient-mark-mode: t
Recent messages:
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Features:
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prog-mode register page menu-bar rfn-eshadow timer select scroll-bar
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cl-generic cham georgian utf-8-lang misc-lang vietnamese tibetan thai
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multi-tty make-network-process emacs)
Memory information:
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0001-Don-t-strip-space-from-python-completions.patch