Can’t rectify a condition in the right way when there are multiple nots involved

I’m trying to combine multiple not conditions in a single line but I can’t make it. This is how the conditional statements should be built upon:

when stat has a value and both the value of alternative and successor are nothing then only the script should print true.

When I try the following, I get true as the result.

stat = "o"
alternative = ""
successor = ""

if stat and not (alternative and successor):
    print("true")

However, When I execute the following, I also get true as the result

stat = "o"
alternative = "p"
successor = ""

if stat and not (alternative and successor):
    print("true")

How can I rectify the condition above to serve the purpose?

Answer

both the value of alternative and successor are nothing

This literally translates to

not alternative and not successor

By De Morgan’s laws it is equivalent to

not (alternative or successor)