Requested version of python cannot be used as another version has been initialized in shiny apps

Question

Getting the error message

ERROR: The requested version of Python
('~/.virtualenvs/python_environment/bin/python') cannot be used, as
another version of Python ('/usr/bin/python3') has already been
initialized. Please restart the R session if you need to attach
reticulate to a different version of Python.
Error in value[[3L]](cond) : 
  failed to initialize requested version of Python
Calls: local ... tryCatch -> tryCatchList -> tryCatchOne -> <Anonymous>
In addition: Warning message:
In py_initialize(config$python, config$libpython, config$pythonhome,  :
  '.Random.seed[1]' is not a valid integer, so ignored
Execution halted

When loading my web app on shiny apps. The app only loads after I refresh the web page

Here is part of my code:

library(shinyWidgets)
library(tidyverse)
library(reticulate)
library(DT)
library(data.table)
virtualenv_create(envname = "python_environment",python="python3")
virtualenv_install("python_environment", packages =c('pandas','catboost'))
use_virtualenv("python_environment",required = TRUE)

Answer 1

When you run library(reticulate), the reticulate package will try to initialize a version of Python, which may not be the version that you intend to use. To avoid this, (in a new R session) run your set-up commands without importing the full reticulate library with the :: syntax like this:

reticulate::virtualenv_create(envname = 'python_environment', 
                              python= 'python3')
reticulate::virtualenv_install("python_environment", 
                               packages=c('pandas','catboost'))
reticulate::use_virtualenv("python_environment",required = TRUE)

Answer 2

To install package tensorflow (for example) to a certain Python environment:

install.packages("tensorflow")

reticulate::virtualenv_create(envname = "Experiment", python = "C:/Users/Acer/AppData/Local/Programs/Python/Python310/python.exe")
## Virtual environment 'Experiment' successfully created.

reticulate::virtualenv_install("Experiment", packages = "tensorflow")
## OK

reticulate::use_virtualenv("Experiment", required = TRUE)

library(tensorflow)
tf$constant("Hello Tensorflow!")