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    • How do I upgrade Python?
    Community Discussion 545 views · 7 replies ·
    Tofloor
    poster avatar
    tadorhead
    deepin
    2016-07-02 12:52
    Author
    I want to use python 3 for my development but the system, by default, uses python 2.7. I've used the code:

    1. alias python=python3
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    But it only works temporarily. I want to use Python 3.5.2 permanently. I would greatly appreciate the help.
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    omelette
    deepin
    2016-07-03 06:08
    #1
    Why not just add 'alias python=python3' to /etc/rc.local so that it's executed at startup?
    Reply View the author
    tadorhead
    deepin
    2016-07-03 07:31
    #2
    I never thought of that. Thank you. could you tell me exactly where to insert the code?Here's what the file looks like :
    1. #!/bin/sh -e
    2. #
    3. # rc.local
    4. #
    5. # This script is executed at the end of each multiuser runlevel.
    6. # Make sure that the script will "exit 0" on success or any other
    7. # value on error.
    8. #
    9. # In order to enable or disable this script just change the execution
    10. # bits.
    11. #
    12. # By default this script does nothing.

    14. exit 0
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    omelette
    deepin
    2016-07-05 07:38
    #3
    Oops, sorry, missed your post.  You should put it before the 'exit 0' - but having just tried it, it doesn't work!

    I did a google though, and what does work is including it in the hidden ~/.bashrc file.   But if the file doesn't exist, like it didn't on this Mint/Mate setup, create a new one, adding the alias line.  Reboot, and it (should) now default to Python3 - at least it does for me!
    Reply View the author
    tadorhead
    deepin
    2016-07-07 15:40
    #4
    https://bbs.deepin.org/post/31220
    Oops, sorry, missed your post.  You should put it before the 'exit 0' - but having just tried it, it ...

    Awesome! Fortunately, this file already exist in my etc/ folder. I'm not familiar with these bash file and need assists on where to put the code properly. Here's what the file looks like:

    1. # System-wide .bashrc file for interactive bash(1) shells.

    3. # To enable the settings / commands in this file for login shells as well,
    4. # this file has to be sourced in /etc/profile.

    6. # If not running interactively, don't do anything
    7. [ -z "$PS1" ] && return

    9. # check the window size after each command and, if necessary,
    10. # update the values of LINES and COLUMNS.
    11. shopt -s checkwinsize

    13. # set variable identifying the chroot you work in (used in the prompt below)
    14. if [ -z "${debian_chroot:-}" ] && [ -r /etc/debian_chroot ]; then
    15.     debian_chroot=$(cat /etc/debian_chroot)
    16. fi

    18. # set a fancy prompt (non-color, overwrite the one in /etc/profile)
    19. PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w\$ '

    21. # Commented out, don't overwrite xterm -T "title" -n "icontitle" by default.
    22. # If this is an xterm set the title to user@host:dir
    23. #case "$TERM" in
    24. #xterm*|rxvt*)
    25. #    PROMPT_COMMAND='echo -ne "\033]0;${USER}@${HOSTNAME}: ${PWD}\007"'
    26. #    ;;
    27. #*)
    28. #    ;;
    29. #esac

    31. # enable bash completion in interactive shells
    32. #if ! shopt -oq posix; then
    33. #  if [ -f /usr/share/bash-completion/bash_completion ]; then
    34. #    . /usr/share/bash-completion/bash_completion
    35. #  elif [ -f /etc/bash_completion ]; then
    36. #    . /etc/bash_completion
    37. #  fi
    38. #fi

    40. # if the command-not-found package is installed, use it
    41. if [ -x /usr/lib/command-not-found -o -x /usr/share/command-not-found/command-not-found ]; then
    42.         function command_not_found_handle {
    43.                 # check because c-n-f could've been removed in the meantime
    44.                 if [ -x /usr/lib/command-not-found ]; then
    45.                    /usr/lib/command-not-found -- "$1"
    46.                    return $?
    47.                 elif [ -x /usr/share/command-not-found/command-not-found ]; then
    48.                    /usr/share/command-not-found/command-not-found -- "$1"
    49.                    return $?
    50.                 else
    51.                    printf "%s: command not found\n" "$1" >&2
    52.                    return 127
    53.                 fi
    54.         }
    55. fi
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    Thank you for your patience and help
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    josemicoronil
    deepin
    2016-07-25 13:49
    #5
    Have you tried installing python3? I had no problem at all installing Python3 and IDLE from Synaptic :-/
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    tadorhead
    deepin
    2016-08-01 18:02
    #6
    https://bbs.deepin.org/post/31220
    Have you tried installing python3? I had no problem at all installing Python3 and IDLE from Synaptic ...

    I have not! I'll try it and see if that works. Thanks for the reply!
    Reply View the author
    linkstat
    deepin
    2016-08-03 19:33
    #7
    in Debian-based systems, you should use alternatives.
    try to install the more friendly GUI program to manage debian laternatives:

    aptitude install galternatives

    then run galternatives (from your desktop)

    and change the default value for python alternative (and any other alternative for the system)

    Greetings!
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