python绘制趋势图的示例

import matplotlib.pyplot as plt #plt用于显示图片 import matplotlib.image as mping #mping用于读取图片 import datetime as dt import matplotlib.dates as mdates from pylab import * def draw_trend_chart(dates,y): mpl.rcParams['font.sans-serif'] = ['SimHei'] #指定默认字体 mpl.rcParams['axes.unicode_minus'] = False #解决保