checking if string only containing letters AND spaces [duplicate]

This question already has an answer here:

• Checking if string is only letters and spaces - Python 4 answers

I want the output of my program to say that if you have an input like “hey there!" The letters and spaces check should say “no” because of the exclamation point, or "hey" it should also read no because there are no spaces, but if the user inputs "hey there" it will say yes only spaces and letter. However, I am stuck because I can't get it to read no when I have the "!"

   only_alpha = False
   only_space = False
   other_characters = False

    for character in string:
        if character.isalpha():
            only_alpha = True
        if character == " ":
            only_space = True
        else:
            other_characters = True
    if only_alpha == True and only_space == True:
        print("Contains only letters and spaces: yes")
    elif other_characters == True:
        print("Contains only letters and spaces: no")

    else:
        print("Contains only letters and spaces: no")