import pandas as pd
import numpy as np
import seaborn as sns
import matplotlib as mpl
import matplotlib.pyplot as plt
df1=pd.read_excel('D:/CW/df.xlsx',sheetname=0)#读入数据,注意sheetname是从0开始
df2=pd.read_excel('D:/CW/df.xlsx',sheetname=1)
df3=pd.read_excel('D:/CW/df.xlsx',sheetn