How to fix column calculation in Python readline if using color prompt

Question

I use standard tips for customizing interactive Python session:

$ cat ~/.bashrc
export PYTHONSTARTUP=~/.pystartup

$ cat ~/.pystartup
import os
import sys
import          


        

Answer 1

I open info readline and found:

 -- Function: int rl_expand_prompt (char *prompt)
     Expand any special character sequences in PROMPT and set up the
     local Readline prompt redisplay variables.  This function is
     called by `readline()'.  It may also be called to expand the
     primary prompt if the `rl_on_new_line_with_prompt()' function or
     `rl_already_prompted' variable is used.  It returns the number of
     visible characters on the last line of the (possibly multi-line)
     prompt.  Applications may indicate that the prompt contains
     characters that take up no physical screen space when displayed by
     bracketing a sequence of such characters with the special markers
     `RL_PROMPT_START_IGNORE' and `RL_PROMPT_END_IGNORE' (declared in
     `readline.h'.  This may be used to embed terminal-specific escape
     sequences in prompts.

As say text I search for RL_PROMPT_START_IGNORE and RL_PROMPT_END_IGNORE definition in readline.h and found next:

/* Definitions available for use by readline clients. */
#define RL_PROMPT_START_IGNORE  '\001'
#define RL_PROMPT_END_IGNORE    '\002'

So I put appropriate changes to my ~/.pystartup:

    green='\001\033[32m\002'
    red='\001\033[31m\002'
    reset='\001\033[0m\002'

and now all work fine!!!

Answer 2

For a better python shell experience, I'd recommend you to use either ipython or bpython.