Flatten.py

#Input Variable
nestedX = [[[[[1, 2, [[[3]]]], 4]]]]

#Recursive function written quickly. 
def flatten(nX):
        flatX = []
        for x in nX:
                if isinstance(x,int):
                        flatX += [x]
                else:
                        flatX += flatten(x)

        return flatX

#print the output
print flatten(nestedX)

#Funny and ugly way to do it :P :P (list function needed for python 3.x not 2.x). Never do it in REAL LIFE!
#print list(map(int,str(nestedX).replace('[','').replace(']','').split(',')))