Here'sthetraceback:________________________test_read_single_cell_formula[False-='Sheet2 - Numbers'!D5]________________________exc=<class'ResourceWarning'>value=ResourceWarning("unclosed file <_io.BufferedReader name='sample.xlsx'>")tb=<tracebackobjectat0x10e3f4b00>,limit=None,chain=Truedefformat_exception(exc,/,value=_sentinel,tb=_sentinel,limit=None, \chain=True):"""Format a stack trace and the exception information.        The arguments have the same meaning as the corresponding arguments        to print_exception().  The return value is a list of strings, each        ending in a newline and some containing internal newlines.  When        these lines are concatenated and printed, exactly the same text is        printed as does print_exception().        """value,tb=_parse_value_tb(exc,value,tb)>te=TracebackException(type(value),value,tb,limit=limit,compact=True)chain=Trueexc=<class'ResourceWarning'>limit=Nonetb=<tracebackobjectat0x10e3f4b00>value=ResourceWarning("unclosed file <_io.BufferedReader name='sample.xlsx'>")/opt/local/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/traceback.py:139:_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _/opt/local/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/traceback.py:688:in__init__self.stack=StackSummary._extract_from_extended_frame_gen(_seen= {4539126048}capture_locals=Falsecompact=Trueexc_traceback=<tracebackobjectat0x10e3f4b00>exc_type=<class'ResourceWarning'>exc_value=ResourceWarning("unclosed file <_io.BufferedReader name='sample.xlsx'>")is_recursive_call=Falselimit=Nonelookup_lines=Truemax_group_depth=10max_group_width=15self=<traceback.TracebackExceptionobjectat0x10e4029d0>/opt/local/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/traceback.py:416:in_extract_from_extended_frame_genforf, (lineno,end_lineno,colno,end_colno)inframe_gen:capture_locals=Falsefnames=set()frame_gen=<generatorobject_walk_tb_with_full_positionsat0x10d50c3c0>klass=<class'traceback.StackSummary'>limit=Nonelookup_lines=Trueresult= []_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _tb=<tracebackobjectat0x10e3f4b00>def_walk_tb_with_full_positions(tb):# Internal version of walk_tb that yields full code positions including# end line and column information.whiletbisnotNone:>positions=_get_code_position(tb.tb_frame.f_code,tb.tb_lasti)EAttributeError:'frozenset'objecthasnoattribute'f_code'tb=<tracebackobjectat0x10e3f4b00>/opt/local/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/traceback.py:353:AttributeError==========================================shorttestsummaryinfo==========================================FAILEDopenpyxl/tests/test_iter.py::test_read_single_cell_formula[False-='Sheet2 - Numbers'!D5]-Attribut...===========================1failed,2467passed,16skipped,6xfailedin8.24s===========================ERROR:InvocationErrorforcommand/Users/charlieclark/Projects/openpyxl/.tox/py311/bin/pytestopenpyxl (exitedwithcode1)__________________________________________________summary__________________________________________________ERROR:py311:commandsfailed