如何向df.boxplot添加y轴标签

import pandas as pd
import matplotlib.pyplot as plt

data = {'A': [1, 2, 3, 4, 5],
        'B': [2, 4, 6, 8, 10],
        'C': [3, 6, 9, 12, 15]}
df = pd.DataFrame(data)

ax = df.boxplot()

ax.set_ylabel("Y轴标签")

import pandas as pd
import matplotlib.pyplot as plt

data = {'A': [1, 2, 3, 4, 5],
        'B': [2, 4, 6, 8, 10],
        'C': [3, 6, 9, 12, 15]}
df = pd.DataFrame(data)

ax = df.boxplot()
ax.set_ylabel("Y轴标签")

plt.show()