通过每第n个xtick标签使Matplotlib date xtick标签更加稀疏(分散)

import matplotlib.pyplot as plt
import matplotlib.dates as mdates

# 准备数据
dates = [datetime.date(2022, 1, i) for i in range(1, 32)]
values = [i for i in range(1, 32)]

# 设置日期刻度格式
locator = mdates.DayLocator()  # 设置每天为刻度
formatter = mdates.DateFormatter('%Y-%m-%d')  # 设置日期格式

fig, ax = plt.subplots()
ax.plot(dates, values)

# 设置x轴刻度为日期刻度
ax.xaxis.set_major_locator(locator)
ax.xaxis.set_major_formatter(formatter)

# 设置每第3个xtick标签可见，其他不可见
for label in ax.get_xticklabels():
    if label.get_visible():
        label.set_visible(False)
    else:
        label.set_visible(True)