Ian Hobson於 2019年10月20日星期日 UTC+8下午6時05分11秒寫道： > Hi Jach, > > On 20/10/2019 09:34, jf...@ms4.hinet.net wrote: > > What puzzles me is how a parent's method foo() can find its child's method > > goo(), no matter it was overwrote or not? MRO won't explain this and I > > can't find document about it also:-( > > This is a generalised description - Python may be slightly different. > > When foo invokes goo the search for goo starts at the class of the > object (which is B), not the class of the executing method (i.e not A). > It then proceeds to look for goo up the class hierarchy - first in B, > then A then Object. > > If that fails the RTS modifies the call, to look for a magic method, and > starts again at B. When the magic method is found in Object, you get the > "not found" error. If you implement the magic method in A or B it will > be run instead. > > Regards > > Ian > > -- > This email has been checked for viruses by AVG. > https://www.avg.com
I see. An obj.method will be resolved according to the MRO of the obj's class, no matter where it is located. Thank you. --Jach -- https://mail.python.org/mailman/listinfo/python-list
