importcopyclassNode:def__init__(self):self._parents= {}def__getstate__(self):return {'_parents': {}}def__setstate__(self,data_dict):self.__dict__=data_dictself._parents= {}defcall_copy(self):copy.copy(super())classD(dict):passobj=Node()obj.call_copy()obj.call_copy()obj.__setstate__(D())

python: Python/generated_cases.c.h:5594: _PyEval_EvalFrameDefault: Assertion`PyDict_CheckExact((PyObject*)dict)' failed.#0  __pthread_kill_implementation (threadid=<optimized out>, signo=6, no_tid=0)    at ./nptl/pthread_kill.c:44#1  __pthread_kill_internal (threadid=<optimized out>, signo=6) at ./nptl/pthread_kill.c:78#2  __GI___pthread_kill (threadid=<optimized out>, signo=signo@entry=6)    at ./nptl/pthread_kill.c:89#30x00007ffff7c4519e in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26#40x00007ffff7c28902 in __GI_abort () at ./stdlib/abort.c:79#50x00007ffff7c2881e in __assert_fail_base (    fmt=0x7ffff7dde2a0 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n",    assertion=assertion@entry=0x55555590a6c0 "PyDict_CheckExact((PyObject *)dict)",    file=file@entry=0x5555558cbb1f "Python/generated_cases.c.h", line=line@entry=5594,    function=function@entry=0x555555964500 <__PRETTY_FUNCTION__.72> "_PyEval_EvalFrameDefault")    at ./assert/assert.c:96#60x00007ffff7c3b7c7 in __assert_fail (    assertion=assertion@entry=0x55555590a6c0 "PyDict_CheckExact((PyObject *)dict)",    file=file@entry=0x5555558cbb1f "Python/generated_cases.c.h", line=line@entry=5594,    function=function@entry=0x555555964500 <__PRETTY_FUNCTION__.72> "_PyEval_EvalFrameDefault")    at ./assert/assert.c:105#70x00005555557b1e76 in _PyEval_EvalFrameDefault (tstate=0x555555b604c0 <_PyRuntime+299040>,    frame=0x7ffff7fb0090, throwflag=0) at Python/generated_cases.c.h:5594#80x00005555557b4b05 in _PyEval_EvalFrame (    tstate=tstate@entry=0x555555b604c0 <_PyRuntime+299040>, frame=<optimized out>,    throwflag=throwflag@entry=0) at ./Include/internal/pycore_ceval.h:119#90x00005555557b4c34 in _PyEval_Vector (tstate=tstate@entry=0x555555b604c0 <_PyRuntime+299040>,    func=func@entry=0x7ffff74674d0, locals=locals@entry=0x7ffff7463d70, args=args@entry=0x0,    argcount=argcount@entry=0, kwnames=kwnames@entry=0x0) at Python/ceval.c:1816#100x00005555557b4cf7 in PyEval_EvalCode (co=co@entry=0x7ffff7566d40,    globals=globals@entry=0x7ffff7463d70, locals=locals@entry=0x7ffff7463d70)    at Python/ceval.c:604#110x00005555558225c5 in run_eval_code_obj (    tstate=tstate@entry=0x555555b604c0 <_PyRuntime+299040>, co=co@entry=0x7ffff7566d40,    globals=globals@entry=0x7ffff7463d70, locals=locals@entry=0x7ffff7463d70)    at Python/pythonrun.c:1381