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def isList ( exp ) :

return type(exp) == type([])

def isFlat(someList):

for k in someList:

if isList(k): return False

return True

def nestSum(someList):

if someList == []:

return 0

if (not isList(someList)):

return someList

return sum(map(nestSum, someList))

def nestSum2(someList):

if someList == []:

return 0

if (not isList(someList)):

return someList

first = someList[0]

rest = someList[1:]

return nestSum2(first) + nestSum2(rest)

def flatten(someList):

if (not isList(someList)):

return [someList]

if isFlat(someList): return someList

return (map(flatten, someList))

print isList([1,2,3])

print isFlat([1,2,3])

print nestSum([1,2,[5,6],3])

print nestSum2([1,2,[5,6],3])

print flatten([1,2,[3,4]])