TypeError: float() argument must be a string or a number, not ‘Period’

Here is the simplest answer,No need to upgrade or downgrade the pandas.

pd.plotting.register_matplotlib_converters()

sometime registering causing another error which is like compute.use_bottleneck, use_numexpr error for getting rid of that call deregister 😛

Like: pd.plotting.deregister_matplotlib_converters()

source:Link