Transforming Python list of tuples to R named vector

Question

I have python reticulate function which returns list of two length tuples of type (id, name).

# In the python API
returned_list = [
    (1, "Jon Doe"),
    (2, "Jane Doe"),
]

library(shiny)
library(reticulate)
# source and other staff

API <- pythonAPI()
values <- API.call() # Returns R list of 2 length lists
values
#   [,1]   [,2] 
# [1,] List,2 List,2
for(index in 1:length(values)){
    message(values[index])
# list(1, "Jon Doe")
# list(2, "Jane Doe")

This values list is supposed to go as choices for shiny's selectInput choices parameter. This choices parameter should have name as the value shown to the user and id as hidden value processed in the program.

selectInput("_id", "Choose name", choices)

How to transform values returned from Python API to fit use-case?

I added more clear definition of the returned data types as requested. — vahvero, May 13 '20 at 07:35

score 1 · Accepted Answer · answered May 13 '20 at 07:43

My coworker managed to come up with solution.

# Create dataframe scaffold
df <- data.frame("name" = NA, "id" = NA)
# Bind values from values to the scaffold by rows
for (i in seq(values)) {
    df_tmp <- rbind.data.frame(values[[i]])
    colnames(df_tmp) <- c("name", "id")
    df <- rbind(df, df_tmp)
}

## Remove empty first row
df <- df[!is.na(df$name),]
    
# Transform to right format for shinyapp UI
choices <- setNames(df$name, df$id)

Transforming Python list of tuples to R named vector

1 Answers1