[Python] Set margins of a time series plotted with pandas

I have the following code for generating a time series plot

import numpy as np
fig = plt.figure()
ax = fig.add_subplot(111)
series = pd.Series([np.sin(ii*np.pi) for ii in range(30)],
index=pd.date_range(start='2019-01-01', end='2019-12-31',
periods=30))
series.plot(ax=ax)




I want to set an automatic limit for x and y, I tried using ax.margins() but it does not seem to work:

ax.margins(y=0.1, x=0.05)
# even with
# ax.margins(y=0.1, x=5)




What I am looking for is an automatic method like padding=0.1 (10% of whitespace around the graph)

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