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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_internals(self):
 """Gets a new grouped symbol `sgroup`. The output of `sgroup` is a list of outputs of all of the internal nodes. Consider the following code: Example ------- <Symbol Grouped> ['a', 'b', '_plus4_output'] Returns ------- sgroup : Symbol A symbol group containing all internal and leaf nodes of the computation graph used to compute the symbol. """

        handle = SymbolHandle()
        check_call(_LIB.MXSymbolGetInternals(
            self.handle, ctypes.byref(handle)))
        return Symbol(handle=handle)