Python pandas bar plot with multiple alpha values

Trying to create a bar plot with alpha transparency values for different time series.

Would think the below would give me that, as I’ve seen elsewhere lists can be passed via the alpha kwarg but throws the error below. What am I missing?

plt.figure()
df.plot(kind="bar", alpha=[.5,1])

..

TypeError: alpha must be numeric or None, not <class 'list'>

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