Convert dataframes of R & Python using rpy2 in jupyter

rpy2_in_jupyter.txt

# ------ a python cell ------
%load_ext rpy2.ipython

pd_df = pd_df.T

# ------ an R cell ------
%%R -i pd_df
# `-i pd_df` means access to the global variable pd_df

r_df = do.something(pd_df)


## ------ another python cell ------
# r object back to python (pandas df)
import rpy2.robjects as ro
from rpy2.robjects import pandas2ri
from rpy2.robjects.conversion import localconverter

res = ro.r['r_df']
with localconverter(ro.default_converter + pandas2ri.converter):
    pd_df_2 = ro.conversion.rpy2py(res)