On Sat, Jun 18, 2016 at 3:04 PM, boB Stepp <robertvst...@gmail.com> wrote: > I have (Finally!) gotten a bit of time to look at Peter's answer to my > Model-View-Controller question from May 29th, particularly his > CircleImageView class to which he added a "#FIXME" comment. I thought > it would be helpful to abbreviate his distance function in the > interpreter while I played around with pencil and graph paper. I got: > > Python 3.5.1 (v3.5.1:37a07cee5969, Dec 6 2015, 01:54:25) [MSC v.1900 > 64 bit (AMD64)] on win32 > Type "help", "copyright", "credits" or "license" for more information. > py3: def d(row, col/2, radius=5): > File "<stdin>", line 1 > def d(row, col/2, radius=5): > ^ > SyntaxError: invalid syntax > > And this surprised me. It seems that only identifiers are allowed as > parameters in a function definition statement, and I cannot help but > wonder why? It seems that in most other places in Python's syntax it > will allow one to insert almost any kind of object or expression. > > TIA! > > -- > boB
I'll take a stab. The function is defined once. The parameters name the arguments to be passed when the function is invoked. They can have defaults, but you are asking it to perform a calculation, which would only be done when the function is defined. > _______________________________________________ > Tutor maillist - Tutor@python.org > To unsubscribe or change subscription options: > https://mail.python.org/mailman/listinfo/tutor -- Joel Goldstick http://joelgoldstick.com/blog http://cc-baseballstats.info/stats/birthdays _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
