flatten.py

# flatten deep nested lists
def flatten(S):
    if S == []:
        return S
    if isinstance(S[0], list):
        return flatten(S[0]) + flatten(S[1:])
    return S[:1] + flatten(S[1:])

list_recur.py

# this function recursively performs an operation on nested lists element-wise
import operator
def list_recur(l1, l2, op = operator.add):
	if not l1:
		return type(l1)([])
	elif isinstance(l1[0], type(l1)):
		return type(l1)([list_recur(l1[0], l2[0], op)]) + list_recur(l1[1:],l2[1:], op)
	else:
		return type(l1)([op(l1[0], l2[0])]) + list_recur(l1[1:], l2[1:], op)

nest_operate.py

# this function performs an operation element-wise on deep nested lists
import operator
def nest_operate(a, l, op = operator.add):
	if not l:
		return []
	elif isinstance(l[0], list):
		return [nest_operate(a, l[0], op)] + nest_operate(a, l[1:], op)
	else:
		return [op(a, l[0])] + nest_operate(a, l[1:], op)

Here are a few python functions helpful for operations and manipulation of deep nested lists.