How to Debug Micropython
Listing the Modules
Result:
|  | __main__          gc                uasyncio/funcs    uos
_boot             machine           uasyncio/lock     urandom
_onewire          math              uasyncio/stream   ure
_rp2              micropython       ubinascii         uselect
_thread           onewire           ucollections      ustruct
_uasyncio         rp2               uctypes           usys
builtins          uasyncio/__init__ uhashlib          utime
ds18x20           uasyncio/core     uio               uzlib
framebuf          uasyncio/event    ujson
Plus any modules on the filesystem
 | 
Micropython issues
https://github.com/micropython/micropython/issues