如何在pandas.DataFrame.plot()中为标题设置字体大小？

import pandas as pd
import matplotlib.pyplot as plt

df = pd.DataFrame({'x': [1, 2, 3, 4, 5], 'y': [2, 4, 6, 8, 10]})
df.plot(x='x', y='y')

plt.title('My Title', fontdict={'fontsize': 14})

import pandas as pd
import matplotlib.pyplot as plt

df = pd.DataFrame({'x': [1, 2, 3, 4, 5], 'y': [2, 4, 6, 8, 10]})
df.plot(x='x', y='y')

plt.title('My Title', fontdict={'fontsize': 14})

plt.show()