Increasing depth in python

[malling]

Okay, so this is my last try.

Im almost done, i just need to make this "start" int function properly.

I made it this far:

def step(rules, state):
   result=[]
   for x in state:
      if x==rules:
         result.append(state)
      else:
         result.append(x)

   flatten = [inner for outer in result for inner in outer]
   print(flatten)

#this function description is to write a function compute(depth,rules,start) that uses the step function depth times to transform the list start into a list representing a fractal of depth depth.
   def compute(depth, rules, start):
      for i in range(depth):
         step("F",["F","L","F","R","F","L","F"])

compute(1,"F",["F","R"])

the list "start" is not in use right now, and i just need some hints to what i can do.
I think i came a lot longer on my own, so can you plz help me a bit here?

I've written what the function is supposed to do in the #symbol above the def compute() function.

best regards Malling