On Fri, 13 Oct 2017 11:54 pm, Gregory Ewing wrote: > Neil Cerutti wrote: >> I can tell at a glance if a parameter is expected to be >> modifiable just by looking at the function signature. > > The question is why doesn't anyone feel the need to be > able to do that for Python functions? Whether a function > modifies things passed to it is just as important to > know in Python as it is in C.
Lots of people would like Python to have a "freeze" function that can make immutable objects, it is a moderately common feature request. Some people (myself included) would like a "const" declaration that gives us names that can only be bound to once: const spam = "NOBODY expects the Spanish Inquisition!!!" # Okay spam = "foo" # Error. I don't mind if that is a runtime error, although a compile time error would be nicer. I don't know if either of these (actual immutable pure-Python objects, and un-rebindable names) count as quite the same thing you are asking Neil about. But I trust they're related. -- Steve “Cheer up,” they said, “things could be worse.” So I cheered up, and sure enough, things got worse. -- https://mail.python.org/mailman/listinfo/python-list
