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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 debug_str(self):
 """Get a debug string about internal execution plan. Returns ------- debug_str : string Debug string of the executor. Examples -------- Symbol Outputs: 	 output[0]=_plus0(0) Variable:a Op:_mul_scalar, Name=_mulscalar0 Inputs: 	 arg[0]=a(0) version=0 Attrs: 	 scalar=2 Op:sin, Name=sin0 Inputs: 	 arg[0]=a(0) version=0 Op:elemwise_add, Name=_plus0 Inputs: 	 arg[0]=_mulscalar0(0) 	 arg[1]=sin0(0) Total 0 MB allocated Total 11 TempSpace resource requested """

        debug_str = ctypes.c_char_p()
        check_call(_LIB.MXExecutorPrint(
            self.handle, ctypes.byref(debug_str)))
        return py_str(debug_str.value)