Python 3.11.0 : Use python to set your R application on shinyapps.io.

If you use the R programming language and shinyapps.io then you can use Python to set up your application.

I create my folder and I install the rsconnect-python python package.

mkdir rsconnect-python-001
cd rsconnect-python-001
pip install rsconnect-python --user
Collecting rsconnect-python

From the shinyapps webpage, I got my token and my secret for my account and I used this command:

rsconnect add --account catafest --name catafest --token YOUR_TOKEN --secret YOUR_SECRET

Detected the following inputs:
    name: COMMANDLINE
    insecure: DEFAULT
    account: COMMANDLINE
    token: COMMANDLINE
    secret: COMMANDLINE
Checking shinyapps.io credential...              [OK]
Added shinyapps.io credential "catafest".

You can see is set and working.

I used a simple R source code named app.r:

library(shiny)

# Definirea interfeței utilizatorului
ui <- fluidPage(
  titlePanel("Aplicație Shiny Simplă"),
  sidebarLayout(
    sidebarPanel(
      numericInput("num", "Introduceți un număr:", value = 1),
      actionButton("goButton", "Generează")
    ),
    mainPanel(
      textOutput("rezultat")
    )
  )
)

# Definirea serverului
server <- function(input, output) {
  observeEvent(input$goButton, {
    num <- input$num
    output$rezultat <- renderText({
      paste("Numărul introdus este:", num)
    })
  })
}

# Crearea aplicației Shiny
shinyApp(ui, server)

The app.py file has this source code:

import dash
import dash_core_components as dcc
import dash_html_components as html
from dash.dependencies import Input, Output

# Creați o aplicație Dash
app = dash.Dash(__name__)

# Definiți aspectul și structura aplicației
app.layout = html.Div([
    html.H1("Aplicație Dash Simplă"),
    dcc.Graph(id='grafic'),
    dcc.Input(id='input-numar', type='number', value=1),
    html.Div(id='rezultat')
])

# Definiți funcția callback pentru actualizarea graficului
@app.callback(
    Output('grafic', 'figure'),
    Input('input-numar', 'value')
)
def actualizare_grafic(numar):
    # Implementați logica de actualizare a graficului aici
    # Exemplu simplu: Un grafic cu o linie dreaptă cu panta egală cu numărul introdus
    import plotly.express as px
    import pandas as pd
    
    data = pd.DataFrame({'x': range(10), 'y': [numar * x for x in range(10)]})
    
    fig = px.line(data, x='x', y='y', title='Graficul personalizat')
    
    return fig

# Rulează aplicația
if __name__ == '__main__':
    app.run_server(debug=True)

I run this command into the RGUI command :

shiny::runApp("C:/PythonProjects/rsconnect-python-001/")

Listening on http://127.0.0.1:7036

The result on browser is this:

I used this command to deploy the application on shinyapps.io:

>rsconnect deploy shiny . --name catafest --title test
[WARNING] 2023-09-01T22:28:10+0300 Can't determine entrypoint; defaulting to 'app'
    Warning: Capturing the environment using 'pip freeze'.
             Consider creating a requirements.txt file instead.
...
Task done: Stopping old instances
Application successfully deployed to https://catafest.shinyapps.io/test/
...
  deploying - Starting instances
Task done: Stopping old instances
Application successfully deployed to https://catafest.shinyapps.io/rsconnect-python-001/
←[32;20m        [OK]
←[0m←[0mSaving deployed information...←[0m←[32;20m      [OK]
←[0m

The result can be found on the shinyapps.io - admin.

I need to fix this error, but first test without app.py was deploy on web.

[notice] A new release of pip is available: 23.1.2 -> 23.2.1
[notice] To update, run: /srv/connect/venv/bin/python3 -m pip install --upgrade pip
[2023-09-01T22:43:31.378864990+0000] Copying file manifest.json
←[31;20m        [ERROR]: Application deployment failed with error: Unhandled Exception: Child Task 1332185768 error: 
Unhandled Exception: 599
←[0mError: Application deployment failed with error: Unhandled Exception: Child Task 1332185768 error: 
Unhandled Exception: 599

I will come with better results.