Why does “a == x or y or z” always evaluate to True? How can I compare “a” to all of those?

I am writing a security system that denies access to unauthorized users.

Why does “a == x or y or z” always evaluate to True? How can I compare “a” to all of those?

I am writing a security system that denies access to unauthorized users.

Why does “a == x or y or z” always evaluate to True? How can I compare “a” to all of those?

I am writing a security system that denies access to unauthorized users.

Why does “a == x or y or z” always evaluate to True? How can I compare “a” to all of those?

I am writing a security system that denies access to unauthorized users.

Why does “a == x or y or z” always evaluate to True? How can I compare “a” to all of those?

I am writing a security system that denies access to unauthorized users.

Why does “a == x or y or z” always evaluate to True? How can I compare “a” to all of those?

I am writing a security system that denies access to unauthorized users.