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Recipe 577250 revision 1 

    def flattenlist(L):
        import types
        Types =dir(types)[:-5]
        Types.pop(Types.index('StringType'))
        Types.pop(Types.index('UnicodeType'))
        Types.pop(Types.index('StringTypes'))
        Types.pop(Types.index('ListType'))
        Types.pop(Types.index('ObjectType'))
        Types.pop(Types.index('TupleType'))
        Types = tuple(( eval("types.%s "% i ) for i in  Types))
        tmp = []
        def core(L):
            if  not hasattr(L,'__iter__'):
                return [L]
            else :
                for i in L:
                    if isinstance(i,Types):
                        tmp.append(i)
                        continue
                    if type(i) == type(str()):
                        tmp.append(i)
                    else:
                        core(i)
            return tmp
        return core(L)




#Examples x=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[['x']]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
>>> flattenlist(x)
['x']
>>> x=(((((1)))))
>>> flattenlist(x)
[1]
>>> x=[(),(),[]]
>>> flattenlist(x)
[]
>>> x=[(1),('1'),[1.0]]
>>> flattenlist(x)
[1, '1', 1.0]
>>> x=[[[[[[(((([1,1]))))]]]]]]
>>> flattenlist(x)
[1, 1]
>>> x=1
>>> flattenlist(x)
[1]
>>> x=flattenlist
>>> flattenlist(x)
[<function flattenlist at 0x16a8320>]
>>>

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