Raspbian Python upgrade bash script

py-upgrade.sh

#!/bin/bash

# https://raw.githubusercontent.com/tvdsluijs/sh-python-installer/main/python.sh

# Function to kill all Python processes
kill_python() {
   sudo pkill -f python
}

# Function to remove all old Python versions
remove_old_python() {
   python3 -m pip freeze > pip_packages.txt
   pip freeze | xargs python3 -m pip uninstall -y
   sudo apt-get purge --auto-remove '*python*'
}

# Function to update system
update_system() {
   sudo apt update && sudo apt upgrade -y
}

# Function to install Python from apt
install_python_from_apt() {
   sudo apt-get install -y python3 python3-pip python3-venv
   echo "export PATH=\$PATH:/usr/local/bin" >> ~/.bashrc
   source ~/.bashrc
}

# Function to install Python from source
install_python_from_source() {
   latest_version=$(curl -s https://www.python.org/downloads/ | grep "latest Python" | sed 's/.*Python //; s/.<.*//')
   wget https://www.python.org/ftp/python/$latest_version/Python-$latest_version.tgz
   tar -xf Python-$latest_version.tgz
   cd Python-$latest_version
   ./configure --enable-optimizations
   make -j 4
   sudo make altinstall
   echo "export PATH=\$PATH:/usr/local/bin" >> ~/.bashrc
   source ~/.bashrc
}

# Function to reinstall previously installed packages
reinstall_packages() {
   python3 -m pip install --upgrade pip
   python3 -m pip install -r pip_packages.txt
}

# Main script
echo "Do you want to get the latest Python version from apt or compile it from source?"
select opt in "apt" "source" "uninstall"; do
  case $opt in
      "apt")
          update_system
          install_python_from_apt
          reinstall_packages
          break
          ;;
      "source")
          update_system
          install_python_from_source
          reinstall_packages
          break
          ;;
      "uninstall")
          kill_python
          remove_old_python
          break
          ;;
  esac
done