You might try "librosa" for tempo/beat detection:

https://github.com/librosa/librosa/blob/main/librosa/beat.py

       Track beats using time series input
    >>> y, sr = librosa.load(librosa.ex('choice'), duration=10)
    >>> tempo, beats = librosa.beat.beat_track(y=y, sr=sr)
    >>> tempo
    135.99917763157896

Also see Essentia:

https://essentia.upf.edu/