On 16.04.2017 10:56, Vincent Vande Vyvre wrote:
Hi,
I'm using Python 3.5 and 3.6 in venv and I see a strange behaviour in
the interactive interpreter.
The arrow keys can't be used to move the cursor into the current line of
code or to rewrite the last lines.
With the 3.5 I can use the backspace and erase the code but not in 3.6
Python 3.5.2 (default, Dec 19 2016, 11:46:33)
[GCC 4.8.4] on linux
Type "help", "copyright", "credits" or "license" for more information.
f = "kjhfgt"^[[D # Left Arrow Key
^[[A # Up Arrow Key
Python 3.6.1 (default, Apr 12 2017, 11:39:17)
[GCC 4.8.4] on linux
Type "help", "copyright", "credits" or "license" for more information.
f = "lkjgh"
^[[A^[[B # Up Arrow Key and Backspace Key
File "<stdin>", line 1
^
SyntaxError: invalid syntax
Make sure you build Python (I guess you did this for 3.6, but are
probably using your OS Python3.5) with readline. This needs the dev
version of the readline library installed at build time.
So, step 1 would be to get the library, then rebuild Python3.6 by running:
1) make clean
2) ./configure
3) make
It could be worthwhile checking for other missing optional C libraries
first though. If you want to make sure you have all of them, follow the
steps described here:
https://docs.python.org/devguide/setup.html#build-dependencies
Best,
Wolfgang
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