def plot_price_series(df, ts_lab1, ts_lab2):
#months = mdates.MonthLocator() # every month
fig, ax = plt.subplots()
ax.plot(df.index, df[ts_lab1], label=ts_lab1)
ax.plot(df.index, df[ts_lab2], label=ts_lab2)
#ax.xaxis.set_major_locator(months)
#ax.xaxis.set_major_formatter(mdates.DateFormatter('%b %Y'))
ax.grid(True)
fig.autofmt_xdate()
plt.xlabel('Month/Year')
plt.ylabel('Price ($)')
plt.title('%s and %s Daily Prices' % (ts_lab1, ts_lab2))
plt.legend()
plt.show()
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