def add(a,b):
    return a + b

def exe(x):
    if type(x) in [int, float, bool]:
        return x
    elif x[0] == "if_":
        if exe(x[1]) == True:
            return exe(x[2])
        else:
            return exe(x[3])
    else:
        f = eval(x[0])
        input = [exe(y) for y in x[1:]]
        return f(*input)

array = ["if_",False,["print",["add", 2, 2]],["print",5]]
exe(array)