rate argument only accepts integers

[millardjk]

The underlying python time.sleep() method accepts a float, giving you more resolution that 1s. However, the argument was typed as int, so sub-second rates (eg, 0.5 or 0.2) which may be slow enough for the API while still being significantly faster than 1s cannot be utilized.

[neiaberau]

well actually It looks to me, as this this has already been addressed:
#37

however, as there is no activity by the orignal developers, meaning pull requests are ignored,
the source has not been changed to include this, you will have to do it by yourself