Programming, Day 47
Late start to the day today. Was busy moving a table from mum’s place to mine. This should help my back a lot! Updates: 7p, Getting better with gtypist. 8.15p, Done with Vim 8.20p, No Python Apps tonight 22.33, Just understood the difference between generic sequence operations and methods (my aha for the day!) You can run generic sequence operation across the core object types. For e.g. I can run the len function on strings, or numbers or lists. Methods, are object specific. I can only run numeric methods on numbers and string methods on strings. This probably is why you run generic operations in front of a type, like type(s) and methods as a .whatever like s.isupper. Lutz shows me another quick rule of thumb; when you run the dir function on an object it should list the generic operations with underscores e.g. __len__ and methods just show up as plain attributes later in the listing e.g. swapcase 11.57p, Done with Chapter 4 of the Lutz book. Final big insight for future reference. Polymorphism means that the meaning of an operation (like a +) depends on the objects being operated upon. This turns out to be a key idea (perhaps the key idea) behind using Python well—not censtraining code to specific types makes that code automatically applicable to many types. 