You could express this as:

a = [input() for i in range(10)]
x = input()
print(x in a)

This is more clear IMO, because if you want to have something happen before something else, it's clearest to put them on separate lines, one after the other.

I also don't like using "a have x" to duplicate the behavior of "x in a", because,
per PEP 20: "There should be one-- and preferably only one --obvious way to do it."