TypeError：-=：Python上的'slice'和'int'不支持的操作数类型

Question

你好，我尝试进行时间序列分析，但是我得到了回溯，有人可以帮助我吗？

Python版本：3.6.7

数据集：https://www.kaggle.com/neuromusic/avocado-prices

# ARIMA LİBRARY
from statsmodels.tsa.arima_model import ARIMA
from pandas import datetime

# fit model
model = ARIMA(ts, order=(1,0,1)) # (ARMA) = (1,0,1)
model_fit = model.fit(disp=0)

# predict
start_index = datetime(2015, 1, 4)
end_index = datetime(2018, 3, 25)
forecast = model_fit.predict(start=start_index, end=end_index)

# visualization
plt.figure(figsize=(22,10))
plt.plot(data.date,data.avprice,label = "original")
plt.plot(forecast,label = "predicted")
plt.title("Time Series Forecast")
plt.xlabel("Date")
plt.ylabel("Mean Temperature")
plt.legend()
plt.show()

跟踪：

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-277-17297527abe9> in <module>()
     10 start_index = datetime(2015, 1, 4)
     11 end_index = datetime(2018, 3, 25)
---> 12 forecast = model_fit.predict(start=start_index, end=end_index)
     13 
     14 # visualization

TypeError: unsupported operand type(s) for -=: 'slice' and 'int'