Op 10-09-13 08:09, Steven D'Aprano schreef: > Some time ago, Tom Christiansen wrote about the "Seven Deadly Sins of > Perl": > > http://www.perl.com/doc/FMTEYEWTK/versus/perl.html > > > What design mistakes, traps or gotchas do you think Python has? Gotchas > are not necessarily a bad thing, there may be good reasons for it, but > they're surprising. > > To get started, here are a couple of mine: > > > - Python is so dynamic, that there is hardly anything at all that can be > optimized at compile time. > > - The behaviour of mutable default variables is a gotcha. > > - Operators that call dunder methods like __add__ don't use the same > method resolution rules as regular methods, they bypass the instance and > go straight to the type, at least for new-style classes.
Slice semantics in combination with negative indices. Take ls = range[10] What is the reverse of ls[a : b]? It is [b-1 : a-1: -1] Except of course when a == 0 or b == 0. -- Antoon Pardon -- https://mail.python.org/mailman/listinfo/python-list
