text: import sys
  import subprocess
  import pkg_resources
  
  required = {'pyodbc', 'pandas', 'cryptography', 'click', }
  installed = {pkg.key for pkg in pkg_resources.working_set}
  missing = required - installed
  
  
  if missing:
      # implement pip as a subprocess:
      subprocess.check_call([sys.executable, '-m', 'pip', 'install', *missing])