Forecast Package from R in Python
Yes, you could use the [no longer developed or extended, but maintained] package RPy, or you could use the newer package RPy2 which is actively developed.
There are other options too, as eg headless network connections to Rserve.
I found forecast package from R the best solution for time series analysis and forecasting. 
I want to use it in Python. Could I use rpy and after take the forecast package in Python?