No exactly bad, but can suprise >>> foo=([],) >>> foo[0] += ['bar'] Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: 'tuple' object does not support item assignment >>> foo (['bar'],)
Dne úterý, 10. září 2013 8:09:25 UTC+2 Steven D'Aprano napsal(a): > 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. > > > > > > > > -- > > Steven -- https://mail.python.org/mailman/listinfo/python-list
