How to use call the random function

I have a code which has functions, which should be called randomly. However, when I am running the code:

def print1():
    print(1)
def print2():
    print(2)
def print3():
    print(3)
l=(print1(), print2(), print3())
x=random.choice(l)
x()

it doesn't work properly. It is outputting everything (1,2,3) and gives an error:

''NoneType' object is not callable'

How to fix that?