--- a/eric6/DebugClients/Python/DebugBase.py Wed Sep 23 19:17:00 2020 +0200 +++ b/eric6/DebugClients/Python/DebugBase.py Thu Sep 24 19:13:41 2020 +0200 @@ -969,6 +969,11 @@ "freevars": [str(var) for var in co.co_freevars], "cellvars": [str(var) for var in co.co_cellvars], } + try: + disDict["codeinfo"]["posonlyargcount"] = co.co_posonlyargcount + except AttributeError: + # does not exist prior to 3.8.0 + disDict["codeinfo"]["posonlyargcount"] = 0 return disDict