The following example from https://foxdot.org/documentation/using-the-tempoclock/

def update(key, bpm=None):
    Root.default = int(key)
    if bpm is not None:
        Clock.bpm = bpm
    return

# Schedule for 2 beats in the future
Clock.schedule(update, Clock.now() + 2, args=[4], kwargs={"bpm", 120})




produces the following output.

Welcome to FoxDot! Press Ctrl+H for help.
-----------------------------------------
>>> def update(key, bpm=None):
...     Root.default = int(key)
...     if bpm is not None:
...         Clock.bpm = bpm
...     return
>>> # Schedule for 2 beats in the future
... Clock.schedule(update, Clock.now() + 2, args=[4], kwargs={"bpm", 120})
Traceback (most recent call last):
  File "C:\Users\andre\AppData\Local\Programs\Python\Python36\lib\site-packages\FoxDot\lib\Code\main_lib.py", line 155, in __call__
    exec(self._compile(code), self.namespace)
  File "FoxDot", line 3, in <module>
    import os.path
  File "C:\Users\andre\AppData\Local\Programs\Python\Python36\lib\site-packages\FoxDot\lib\TempoClock.py", line 662, in schedule
    self.queue.add(obj, beat, args, kwargs, is_priority)
  File "C:\Users\andre\AppData\Local\Programs\Python\Python36\lib\site-packages\FoxDot\lib\TempoClock.py", line 765, in add
    for key in list(kwargs.keys()):
AttributeError: 'set' object has no attribute 'keys'