1

我有一个用 Python 3.7 编写的函数,它返回一个 Pandas DataFrame。例子:

import pandas

df = pandas.DataFrame({'foo':[1,2,3], 'bar':['one', 'two', 'three'], 'baz':['apple', 'banana', 'strawberry']})

def returnMyDF():

    return df

这个 Python 文件可能被称为my_dataframe.py

然后在 R 中,我使用 Reticulate 库和 Tidyverse 将 Pandas DataFrame 插入到 Tibble 中。

执行此操作的代码app.R如下所示:

library(tidyverse)
library(reticulate)

use_python("C:/ProgramData/Anaconda3", required = TRUE) 
source_python("C:/the/path/to/my_dataframe.py")

df = returnMyDF()
glimpse(df)

返回以下错误:

Observations: 3 Error in py_call_impl(callable, dots$args, dots$keywords) : IndexError: index 3 is out of bounds for axis 0 with size 3

一些事实:我在 GitHub 中发现了这个问题:https ://github.com/rstudio/reticulate/issues/101 ,我认为这可能会解决。更新到最新版本的网状使用 devtools::install_github("rstudio/reticulate")

会话信息:

sessionInfo()
R version 3.5.2 (2018-12-20)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows >= 8 x64 (build 9200)

Matrix products: default

locale:
[1] LC_COLLATE=English_United States.1252  
LC_CTYPE=English_United States.1252   
[3] LC_MONETARY=English_United States.1252 
LC_NUMERIC=C                          
[5] LC_TIME=English_United States.1252    

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] forcats_0.3.0   stringr_1.4.0   dplyr_0.7.8     purrr_0.3.0     readr_1.3.1     tidyr_0.8.2     tibble_2.0.1   
[8] ggplot2_3.1.0   tidyverse_1.2.1 reticulate_1.10

loaded via a namespace (and not attached):
[1] Rcpp_1.0.0       cellranger_1.1.0 pillar_1.3.1     compiler_3.5.2   plyr_1.8.4       bindr_0.1.1     
[7] tools_3.5.2      lubridate_1.7.4  jsonlite_1.6     nlme_3.1-137     gtable_0.2.0     lattice_0.20-38 
[13] pkgconfig_2.0.2  rlang_0.3.1      Matrix_1.2-15    cli_1.0.1        rstudioapi_0.9.0 yaml_2.2.0      
[19] haven_2.0.0      bindrcpp_0.2.2   withr_2.1.2      xml2_1.2.0       httr_1.4.0       hms_0.4.2       
[25] generics_0.0.2   grid_3.5.2       tidyselect_0.2.5 glue_1.3.0       R6_2.3.0         readxl_1.2.0    
[31] modelr_0.1.3     magrittr_1.5     backports_1.1.3  scales_1.0.0     rvest_0.3.2      assertthat_0.2.0
[37] colorspace_1.4-0 stringi_1.2.4    lazyeval_0.2.1   munsell_0.5.0    broom_0.5.1      crayon_1.3.4`   

为了检查 NumPy 是否有效,我可以更改my_dataframe.py(并适当地更改 app.R)并导入 NumPy 数组......这不会导致任何问题:

import numpy

my_array = numpy.array([42, 2.38, 42])

def returnMyArray():

    return my_array

我的问题是:如何将 Pandas DataFrame 带入任何 R 等效项?

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1 回答 1

1

我主要是 R 用户并开始涉足 python,但一个可能的解决方案可能是将你的 python 代码写在一个Rmarkdown. 您可以在这里互换地编写您的代码python和代码 - 这是一个很好的入门资源https://cran.r-project.org/web/packages/reticulate/vignettes/r_markdown.htmlr

如果您不熟悉 r markdown,我可以提供更多信息。

---
title: "test"
output: html_document
---

```{r setup, include=FALSE}

knitr::opts_chunk$set(echo = TRUE)
#engine to run python
library(reticulate)

```



```{python}
#python code R knows this is python code because you specified 
# this above  "```{python}"

import pandas

df = pandas.DataFrame({'foo':[1,2,3], 'bar':['one', 'two', 'three'], 'baz':['apple', 'banana', 'strawberry']})

print(df)

```



```{r}
#r code 
#refer to get python objects in R code you have to type py$objectname
df2 <- py$df
class(df2)
#data.frame - python equivalent to pandas.DataFrame
```
于 2019-03-01T20:22:56.083 回答