找出这个批量渲染函数中的刻度标签和生命周期错误。
Python
import matplotlib.pyplot as plt
def save_reports(series_by_name):
for name, values in series_by_name.items():
fig, ax = plt.subplots()
ax.bar(range(len(values)), values)
ax.set_xticklabels(["A", "B", "C"])
fig.savefig(f"{name}.png")