Passing a list through a "find" function = error?

I defined a function that allows me to find a specific character in a parameter and returns all subsequent characters. Example:

def function1(parameter1):
    variable1 = parameter1[parameter1.find("&"):]
    variable1 = variable1[1:]
    return variable1

This seems to execute without issue. However, I am having a problem with my second function, which allows me to pass a list through the first function, compare, and return True or False

def function2(list, variable1):
    for parameter1 in list:
        parameter1 = function1(list)
        if variable1 == parameter1:
            return True
        else:
            return False

Then, I define my list and variable1 to for function2 and print:

list = ["abc&123", "def&456", "ghi&789"]
variable1 = "123"
print function2(list,variable1)

I cannot seem to figure out what I've been doing wrong. Something seems to be off wither how I am passing through the list, resulting in errors regarding split or find (I've tried both), and/or my comparison of Variable1 and parameter1. I'm sure there's a small issue here that I keep getting tripped up on, but for the life of me I cannot figure it out.