Check if list contains only item x

Question

Say all of w, x, y, and z can be in list A. Is there a shortcut for checking that it contains only x--eg. without negating the other variables?

w, x, y, and z

Answer 1

There are two interpretations to this question:

First, is the value of x contained in [w,y,z]:

>>> w,x,y,z=1,2,3,2
>>> any(x == v for v in [w,y,z])
True
>>> w,x,y,z=1,2,3,4
>>> any(x == v for v in [w,y,z])
False

Or it could mean that they represent the same object:

>>> w,x,y,z=1,2,3,4
>>> any(x is v for v in [w,y,z])
False
>>> w,x,y,z=1,2,3,x
>>> any(x is v for v in [w,y,z])
True