NotImplementedError:

from statsmodels.tsa.arima_model import ARIMA

modelo = ARIMA(y,order=(1,1,1))

modelo_fit = modelo.fit(disp=0)

print(modelo_fit.summary())

NotImplementedError                       Traceback (most recent call last)
<ipython-input-43-26e1fa967d93> in <module>()
----> 1 modelo = ARIMA(y,order=(1,1,1))
      2 modelo_fit = modelo.fit(disp=0)
      3 print(modelo_fit.summary())

1 frames
/usr/local/lib/python3.7/dist-packages/statsmodels/tsa/arima_model.py in __init__(self, *args, **kwargs)
     27 
     28     def __init__(self, *args, **kwargs):
---> 29         raise NotImplementedError(ARIMA_DEPRECATION_ERROR)
     30 
     31 

NotImplementedError: 
statsmodels.tsa.arima_model.ARMA and statsmodels.tsa.arima_model.ARIMA have
been removed in favor of statsmodels.tsa.arima.model.ARIMA (note the .
between arima and model) and statsmodels.tsa.SARIMAX.

statsmodels.tsa.arima.model.ARIMA makes use of the statespace framework and
is both well tested and maintained. It also offers alternative specialized
parameter estimators.