R ggplotly to Python plotly conversion issues (with beginnings of a possible fix)

Hello Plotly team! I want to make graphs in R’s ggplotly and then run existing Plotly Python code to reformat them. However, I’m getting errors when importing a ggplotly JSON created in R into Plotly in Python.

To fix these errors, I have to resort to either running code to fix them in the JSON (2a below) or setting pio.read_json()’s skip_invalid parameter to true (2b below). , I believe the JSON is valid because 1) The JSON renders correctly in Plotly.js 2) The JSON comes from simple graphs made in ggplotly.

R code:

library(ggplot2)
library(plotly)

# Data
a = data.frame(x = (0:4), y = c(2, 4, 1, 6, 8), group="A")
b = data.frame(x = (0:4), y = c(3, 2, 5, 4, 7), group="B")
data <- rbind(a, b)

# Graph 
fig <- ggplot(data, aes(x, y, color = group)) + geom_line()

#Convert to ggplotly, save as JSON, and export
fig_ggplotly <- ggplotly(fig)
fig_ggplotly_json<-plotly_json(fig_ggplotly, FALSE)
write(fig_ggplotly_json,'fig_ggplotly.json')

2a: Python code - Errors when using json.load( )

import json
import sys

with open(“fig_ggplotly.json", "r") as f:
    fig_ggplotly_json = json.load(f)
print(fig_ggplotly_json)

go.Figure(fig_ggplotly_json) # throws errors; solved with ggplotly_to_plotly.py 

 # Example of invalid parameter:  
fig_ggplotly_json['layout']['font']['family'] # shows value as ‘’. Does not throw error.

2b: Python code - Using pio.read_json() with skip_invalid=True

import json
import sys
import plotly.io as pio

with open("fig_ggplotly.json", "r") as f:
    fig_ggplotly_pio = pio.read_json(f, skip_invalid=True)

# Example of invalid parameter that gets completely eliminated using skip_invalid, causing later issues:   
fig_ggplotly_pio.to_dict()['layout']['font']['family'] #throws KeyError

Skipping elements of the JSON seems to be inviting a loss of fidelity. Indeed, the reformatting code I apply has issues handling some elements due to the skipped invalid parameters. I’ve identified a number of specific elements that are not compatible with Plotly.py and would appreciate it if Plotly.py were to handle this valid input correctly. The ggplotly_to_plotly conversion code, which highlights many of the problem areas for basic graphs, can be found here.

Bắt đầu bằng cách tái tạo bản xuất R ggplotly được cung cấp và nhập bản đó bằng pio.read_json() và go.Figure() của Python. Đọc gist ggplotly_to_plotly.py được liên kết để xem các điểm không tương thích đã xác định. Công việc được xem là hoàn tất khi có thể nhập JSON ggplotly tương thích mà không cần skip_invalid=True, đồng thời vẫn giữ các trường như layout.font.family.