/pandas 0.23

rpy2 / R interface


Up to pandas 0.19, a pandas.rpy module existed with functionality to convert between pandas and rpy2 objects. This functionality now lives in the rpy2 project itself. See the updating section of the previous documentation for a guide to port your code from the removed pandas.rpy to rpy2 functions.

rpy2 is an interface to R running embedded in a Python process, and also includes functionality to deal with pandas DataFrames. Converting data frames back and forth between rpy2 and pandas should be largely automated (no need to convert explicitly, it will be done on the fly in most rpy2 functions). To convert explicitly, the functions are pandas2ri.py2ri() and pandas2ri.ri2py().

See also the documentation of the rpy2 project: https://rpy2.readthedocs.io.

In the remainder of this page, a few examples of explicit conversion is given. The pandas conversion of rpy2 needs first to be activated:

In [1]: from rpy2.robjects import r, pandas2ri
ModuleNotFoundError                       Traceback (most recent call last)
<ipython-input-1-79b90b86f23f> in <module>()
----> 1 from rpy2.robjects import r, pandas2ri

/opt/conda/envs/pandas/lib/python3.6/site-packages/rpy2/robjects/pandas2ri.py in <module>()
     20 import numpy
     21 import pytz
---> 22 import tzlocal
     23 import warnings

ModuleNotFoundError: No module named 'tzlocal'

In [2]: pandas2ri.activate()

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