将R数据框加载到Python中并转换为Pandas数据框

Question

I am trying to run the following code in an R data frame using Python.

from fuzzywuzzy import fuzz
from fuzzywuzzy import process
import os
import pandas as pd
import timeit
from rpy2.robjects import r
from rpy2.robjects import pandas2ri
pandas2ri.activate()

start = timeit.default_timer()

def f(x):
    return fuzz.partial_ratio(str(x["sig1"]),str(x["sig2"]))

def fu_match(file):
    f1=r.load(file)
    f1=pandas2ri.ri2py(f1)
    f1["partial_ratio"]=f1.apply(f, axis=1)
    f1=f1.loc[f1["partial_ratio"]>90]
    f1.to_csv("test.csv")

stop = timeit.default_timer()
print stop - start 

fu_match('test_full.RData')

Here is the error.

AttributeError: 'numpy.ndarray' object has no attribute 'apply'

I guess the problem has to do with the conversion from R to Pandas data frame. I know this is a repeated question, but I have tried all the solutions given to previous questions with no success.

Please, any help will be much appreciated.

EDIT: Here is the head of .RData.

  city                         sig1                         sig2
1    19 claudiopillonrobertoscolari  almeidabartolomeufrancisco
2    19 claudiopillonrobertoscolari cruzricardosantasergiosilva
3    19 claudiopillonrobertoscolari             costajorgesilva
4    19 claudiopillonrobertoscolari    costafrancisconaifesilva
5    19 claudiopillonrobertoscolari          camarajoseluizreis
6    19 claudiopillonrobertoscolari    almeidafilhojoaopimentel

Answer 1

This line

f1=pandas2ri.ri2py(f1)

is setting f1 to be a numpy.ndarray when I think you expect it to be a pandas.DataFrame .

You can cast the array into a DataFrame with something like

f1 = pd.DataFrame(data=f1)

but you won't have your column names defined (which you use in f(x) ). What is the structure of test_full.RData ? Do you want to manually define your column names? If so

f1 = pd.DataFrame(data=f1, columns=("my", "column", "names"))

should do the trick.

BUT I would suggest you look at using a more standard data format, maybe .csv . pandas has good support for this, and I expect R does too. Check out the docs .