Python If-Statement always evaluates to true?

Im very new to Python and decided I would try some basics.

Why does this always evaluate to true? Typing in "False" as UserInput should evaluate False?

true_or_false=input("Is it true or false?")
if true_or_false:
    print("It's true")
if not true_or_false:
    print("Well,it is not true")

Using newest Python Version (3.smth)