如何将此列表列表转换为 R 中的数据框？

Question

Suppose we have something that looks like:

list of two months:

Jan
Feb

Then when you expand Jan and Feb, you see other lists (countries):

Jan -> USA, UK, etc.
Fab -> USA, UK, etc.

Finally, each country is a list, containing two items. Eg opening USA in the Jan list:

USA -> gdp, population

What I'm trying to do is achieve a data frame like so (numbers would just be the values in data):

month country gdp    population
Jan   USA     number no.
Jan   UK      number no.
Feb   USA     number no.
Feb   UK      number no.

I tried bind_rows(list) , which doesn't quite work because the header becomes the countries and the columns are populated with numbers that no longer have their labels.

Does anyone have any ideas?

Edit: dput() output:

list(`Jan` = list(UK = list(date_value = "Jan", 
    country_code = "UK", gdp = 308L, pop = 0L)

Answer 1

Here is an option

library(purrr)
library(dplyr)
map_dfr(lst2, bind_rows)
# A tibble: 2 x 4
#  date_value country_code   gdp   pop
#  <chr>      <chr>        <int> <int>
#1 Jan        UK             308     0
#2 Jan        UK             308     0

data

lst2 <- list(Jan = list(UK = list(date_value = "Jan", country_code = "UK", 
    gdp = 308L, pop = 0L)), Feb = list(UK = list(date_value = "Jan", 
    country_code = "UK", gdp = 308L, pop = 0L)))