Space as input commando python

I'm finessing a script and have encountered a problem.

 def __str__(self):
    """Encourage the user to select a command."""
    return "Welcome to *name of app*! . Press X to start." 

I am able to use the letters on the keyboard as commands(here ex: "X"), but how do I do to use the space bar as a command?

Parts of the current code for commands, for your understanding:

  while user_input != "q":

    user_input = input("Welcome to *name of app*! Choose command:*commands*")
    if user_input == "s":
      self.show_commands()
    elif user_input == "e":
      self.new_task()
    elif user_input == "d":
      self.show_tasks()
    elif user_input == "x":
      self.mark_done()

Hopefully you will understand my problem

Grateful for your help

Thanks in advance