文章目录数据读取数据整理PeriodIndex函数—-时间段优化 数据来源： https://www.kaggle.com/uciml/pm25-data-for-five-chinese-cities 数据读取 from matplotlib import font_manager from matplotlib import pyplot as plt import pandas as pd file_path = "./BeijingPM2.5.csv" df = pd.read_csv(