How to avoid the extra set of y-axis labels?

[deanhystad]

twinx() is a function that creates an additional axis. Each time you call it it makes a new axis. In the working code twinx() is called once, to create one additional axis. You called twinx() multiple times on the same plot. This poor plot has 3 y axis

axs[0].twinx().set_ylabel('SPX Price') # This creates a new axis (#2)
axs[0].plot(sample_df['Spread_Price'],color='red')
axs[0].twinx().plot(sample_df['SPX']) # This creates an additional axis (#3), not the same as above