In order to downgrade R in Python, the Rpy2 package needs to be installed.
Normal to pip install Rpy2 and Easy_install rpy2 both error.
finally on the website http://www.lfd.uci.edu/~gohlke/pythonlibs/ download the. whl file for your system
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Installing Rpy2
Pip Install RPY2-2.7.8-CP34-NONE-WIN32.WHL
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Installation is successful!
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Install rpy2 under Windows