python函数参数问题

def plot_3x3(df, title):
    fig, axs = plt.subplots(3, 3, figsize=(20, 20))
    fig.suptitle(title, fontsize=16)
    df.plot(kind='bar', ax=axs[0, 0], x='date', y='temperature')
    df.plot(kind='bar', ax=axs[0, 1], x='date', y='humidity')
    df.plot(kind='bar', ax=axs[0, 2], x='date', y='winddirection')
    df.plot(kind='bar', ax=axs[1, 0], x='date', y='windpower')
    df.plot(kind='bar', ax=axs[1, 1], x='date', y='rains')
    df.plot(kind='bar', ax=axs[1, 2], x='date', y='rains7041JA23')
    df.plot(kind='bar', ax=axs[2, 0], x='date', y='waterlevels7041JA23')
    df.plot(kind='bar', ax=axs[2, 1], x='date', y='rains7041JA24')
    df.plot(kind='bar', ax=axs[2, 2], x='date', y='waterlevels7041JA24')
    plt.show()

参数df, title分别是啥

df=dataframe
title就是标题