How does jupyter recognize the font color ?

[Jeff Zhang]

I use jupyter_client to execute some python code `range?`, and the result has some special characters as following which I believe it is for font color. Because I notice the font color when I run `range?` in ipython.

Could you anyone point me how jupyter recognize the font color via these specia characters ? Is there standards for that ? Thanks

[{'data': {'text/plain': '\x1b[0;31mInit signature:\x1b[0m \x1b[0mrange\x1b[0m\x1b[0;34m(\x1b[0m\x1b[0mself\x1b[0m\x1b[0;34m,\x1b[0m \x1b[0;34m/\x1b[0m\x1b[0;34m,\x1b[0m \x1b[0;34m*\x1b[0m\x1b[0margs\x1b[0m\x1b[0;34m,\x1b[0m \x1b[0;34m**\x1b[0m\x1b[0mkwargs\x1b[0m\x1b[0;34m)\x1b[0m\x1b[0;34m\x1b[0m\x1b[0m\n\x1b[0;31mDocstring:\x1b[0m     \nrange(stop) -> range object\nrange(start, stop[, step]) -> range object\n\nReturn an object that produces a sequence of integers from start (inclusive)\nto stop (exclusive) by step.  range(i, j) produces i, i+1, i+2, ..., j-1.\nstart defaults to 0, and stop is omitted!  range(4) produces 0, 1, 2, 3.\nThese are exactly the valid indices for a list of 4 elements.\nWhen step is given, it specifies the increment (or decrement).\n\x1b[0;31mType:\x1b[0m           type\n'},

  'source': 'page',

  'start': 0}]

[Thomas Kluyver]

On 6 July 2017 at 16:11, Jeff Zhang <zjf...@gmail.com> wrote:

Could you anyone point me how jupyter recognize the font color via these specia characters ? Is there standards for that ? Thanks

Hi Jeff,

These are ANSI escape codes. They're typically recognised by your terminal emulator, and our non-terminal frontends (notebook, qtconsole) have specific code to process them and show the colours. Wikipedia has some good info on them:
https://en.wikipedia.org/wiki/ANSI_escape_code

The ones we use are mainly the SGR ('Select Graphics Rendition') codes.

Thomas

[Jeff Zhang]

Thanks Thomas.

在 2017年7月7日星期五 UTC+8上午1:00:18，takowl写道：

[Kyle Kelley]

Depending on what your frontend is written in, there are many libraries for turning ANSI text into HTML (or React elements):

https://www.npmjs.com/package/ansi-html

https://github.com/nteract/ansi-to-react

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Kyle Kelley (@rgbkrk; lambdaops.com)