Hi, Chris Thanks for your reply very much. After i debug the code step by step, I'm found the "return cl()" in pykickstart/version.makeVersion() exec the __init__ ! Maybe my description is not clearly, but i'm try to do this. 1. just suppose the DEVEL=F13, use pdb to trace in returnClassForVersion, the v is: --------------------------------- (Pdb) p v <class 'f13.F13Handler'> ================== 2. and returnClassForVersion return a Class to makeVersion 3. the makeVersion instance f13.F13Handler(), but f13.F13Handler does not have a __init__ func, so exec BaseHandler.__init__ instead. I've learned those knowledge in book, but have not used in mycode. So have puzzle above. Thanks again, for the foolish question. Chris Lumens <clumens@xxxxxxxxxx> write： >> where is the "BaseHandler.__init__" exec ? >> >> look at the following code, after func "returnClassForVersion" have executed, >> the "commands" attr of "handler" have fixed by "command-object" mapping already. >> >> but from the line 173 to 177, there is just a imputil.imp.load_module func , >> and the module itself haven't execute a "BaseHandler.__init__" func. >> >> how the "handler" get a fixed attr "commands" ? > >returnClassForVersion just returns the class. It does not return an >instance of that class, so you have to do that yourself. Look at >makeVersion in pykickstart/version.py. That returns an instance of the >class, and that's how the handler gets a commands dict. > >Look at pykickstart/base.py:BaseHandler.__init__. There, >_registerCommands is called which sets up that attr. > >Does that clear things up? > >- Chris > --------------------- Jian Lee [ http://jianlee.ylinux.org ] _______________________________________________ Kickstart-list mailing list Kickstart-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/kickstart-list
