# Guido cannot work in python mode

**URL:** <https://discourse.processing.org/t/guido-cannot-work-in-python-mode/9501>\
**Category:** Processing.py\
**Created:** [March 21, 2019, 3:48am UTC](https://discourse.processing.org/t/guido-cannot-work-in-python-mode/9501 "2019-03-21T03:48:05Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![GoToLoop](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/gotoloop/32/86_2.png) [@GoToLoop](https://discourse.processing.org/u/GoToLoop)\
**Post date:** [March 25, 2019, 9:37pm UTC](https://discourse.processing.org/t/guido-cannot-work-in-python-mode/9501/5 "2019-03-25T21:37:17Z")

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> [@jeremydouglass](#):
>
> Some libraries – those that depend on certain functions being defined in your sketch – will not work.

For such libraries, see whether they offer an alternative way to pass a custom callback (generally an instance of some functional `interface` provided by the library) besides those callbacks directly defined in the PApplet sketch. 😼

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