Hello, I found (what I think is) a bug in PythonMethod.py version 0.1.2 from the PythonMethod product around line 133 (and 246), we have the following expression: self._v_selfish = (fc.co_varnames and fc.co_varnames[0]=='self' and (fc.co_argcount - len(f.func_defaults) - 1)) len(f.func_defaults) is not correct because when your function has no default argument, it is None, and len(None) raises a TypeError. I changed this to read: self._v_selfish = (fc.co_varnames and fc.co_varnames[0]=='self' and (fc.co_argcount - len(f.func_defaults or ()))) But it seems that I have to drop the 'minus 1' to get a correct behavior is func(self, args='') selfish? I think so, but with the 'minus 1', it turns to be wrong! What do you think? -- Cordialement, Jephté CLAIN minf7@educ.univ-reunion.fr PS: répondez sur minf7@educ.univ-reunion.fr, et pas sur ava@dde974.equipement.gouv.fr