代码和结果如下:
df = index_return
df.index = pd.to_datetime(df.index)
df1 = df.resample('AS').sum()
print(df1)
df1 = df.resample('AS').sum().to_period('A')
df1.to_csv(r'C:\Users\Kaixin Feng\Desktop\康睿基金\年度收益.csv',index=0)
print(df1)
保存到csv后,没有了date,表头也是乱码。要怎么解决?显示如图: