Matplotlib会自动选择可以像这样定义的xtick。

df = pd.DataFrame()
df['YearMonth'] = [202303,202302,202301,202212,202211]
df['total_burgers'] = [800,900,1200,1100,1000]
df['YearMonth'] = pd.to_datetime(df['YearMonth'], format='%Y%m')

x = df['YearMonth']
y1 = df['total_burgers']
plt.plot(x, y1)

plt.xticks(x, x.dt.strftime('%Y-%m'), rotation=45)

plt.show()