Converting an RPy2 ListVector to a Python dictionary

Question

The natural Python equivalent to a named list in R is a dict, but RPy2 gives you a ListVector object.

import rpy2.robjects as robjects

a = robjects.r(\'list         


        

Answer 1

The following is my function for the conversion from an rpy2 ListVector to a python dict, capable of handling nested lists:

import rpy2.robjects as ro
from rpy2.robjects import pandas2ri

def r_list_to_py_dict(r_list):
    converted = {}
    for name in r_list.names:
        val = r_list.rx(name)[0]
        if isinstance(val, ro.vectors.DataFrame):
            converted[name] = pandas2ri.ri2py_dataframe(val)
        elif isinstance(val, ro.vectors.ListVector):
            converted[name] = r_list_to_py_dict(val)
        elif isinstance(val, ro.vectors.FloatVector) or isinstance(val, ro.vectors.StrVector):
            if len(val) == 1:
                converted[name] = val[0]
            else:
                converted[name] = list(val)
        else: # single value
            converted[name] = val
    return converted