matplotlib.dates 年月日 小时分，画图

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

# 生成横纵坐标信息
dates = ['2016-12-20 09:52:54', '2016-12-20 15:52:54', '2016-12-20 21:52:54', '2016-12-21 03:52:54']
xs = [datetime.strptime(m,'%Y-%m-%d %H:%M:%S').date() for m in dates]
ys = range(len(xs))
print(xs)
print(ys)
# 配置横坐标
plt.gca().xaxis.set_major_formatter(mdates.DateFormatter('%Y-%m-%d'))
plt.gca().xaxis.set_major_locator(mdates.DayLocator())
# Plot
plt.plot(xs, ys)
plt.gcf().autofmt_xdate()  # 自动旋转日期标记
plt.show()