input: Write a python function to determine if a string is a valid TV show title, ensuring it contains only alphanumeric characters and spaces.
  assert is_valid_show_title("The Simpsons") == True
  assert is_valid_show_title("Seinfeld") == True
  assert is_valid_show_title("Game of Thrones") == True
  assert is_valid_show_title("Breaking Bad!") == False
  assert is_valid_show_title("Str@ngethings") == False
output: def is_valid_show_title(title):
      return all(char.isalnum() or char.isspace() for char in title)