On 08/16/2012 05:26 PM, Paul Rubin wrote: > Dave Angel <d...@davea.name> writes: >> Everything else is implementation defined. Why should an implementation >> be forced to have ANY extra data structure to detect a static bug in the >> caller's code? > For the same reason the interpreter checks for type errors at runtime > and raises TypeError, instead of letting the program go into the weeds.
There's an enormous difference between type errors, which affect the low level dispatch, and checking for whether a dict has changed and may have invalidated the iterator. If we were really going to keep track of what iterators are tracking a given dict or set, why stop there? Why not check if another process has changed a file we're iterating through? Or ... -- http://mail.python.org/mailman/listinfo/python-list
