[IPython-dev] [IPython 5] [Docs] Custom Terminal Prompts

Carl Smith carl.input at gmail.com
Sun Jul 10 21:27:52 EDT 2016

Just to help move things along, this is what I have. It works, except for
the input number always being `1`. I don't know much about some of the
parts, so have no idea why the count doesn't increment.

    import IPython
    from pygments.token import Token

    Prompts = IPython.terminal.prompts.Prompts
    Shell = IPython.terminal.interactiveshell.TerminalInteractiveShell

    class CustomPrompts(Prompts):

        def in_prompt_tokens(self, cli=None): return [
            (Token.Prompt, "CustomIn["),
            (Token.PromptNum, str(self.shell.execution_count)),
            (Token.Prompt, "]: ")

    get_ipython().prompts = CustomPrompts(Shell())

This code creates an input prompt like `CustomIn[1]: `, but the number is
always `1`. Interestingly, the output prompt, which is inherited
unmodified, is also stuck at `1` now. Everything works correctly; you can
input code and so on, but the execution count never updates.

If anyone has any ideas...


-- Carl Smith
carl.input at gmail.com

On 11 July 2016 at 00:20, Carl Smith <carl.input at gmail.com> wrote:

> Thanks Fernando, but please don't put yourself out on my account.
> Obviously, it's something that needs figuring out, but there's no urgency
> here.
> Best,
> -- Carl Smith
> carl.input at gmail.com
> On 11 July 2016 at 00:15, Fernando Perez <fperez.net at gmail.com> wrote:
>> On Sun, Jul 10, 2016 at 4:11 PM, Carl Smith <carl.input at gmail.com> wrote:
>>> No problem at all, Fernando.
>> Great, thanks!
>>> I did have a go at it based on the code Thomas pointed to, but couldn't
>>> figure out how to use the reference to `self.shell.execution_count`. When
>>> it's used directly, as it is in the IPython source (passed through `str`),
>>> you end up with something like this:
>>>     In [<traitlets.traitlets.Int at 0x104800b70>]:
>>> Using the `default_value` and `default_value_repr` methods, gives you
>>> the number, but it was always `1`, no matter what the actual input number
>>> was.
>> Mmh, I'm afraid I haven't really done any significant prompt
>> customizations in years, way before we made the system traitlets-based... I
>> don't have a quick solution handy.  But let's see if someone else can pitch
>> in and we get a solution, otherwise I'll try to dig in later...
>> --
>> Fernando Perez (@fperez_org; http://fperez.org)
>> fperez.net-at-gmail: mailing lists only (I ignore this when swamped!)
>> fernando.perez-at-berkeley: contact me here for any direct mail
>> _______________________________________________
>> IPython-dev mailing list
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