Python - 100 lightbulbs problem

gistfile1.py

"""
This is a simple bit of code which solves the 100 lightbulbs problem.

Its not the most efficient but it does the job.
"""

def switch(list_length, iterations):
    switches_on = []
    switches = { i:False for i in range(1,list_length+1)}

    for i in range(1, iterations+1):
        for j in range(1, list_length+1):
            if j % i == 0:
                switches[j] = False if switches[j] else True

            if i == list_length:
                if switches[j]:
                    switches_on.append(j)
    return switches_on