In issue7092_test_support:
1) silence_py3k_warning should have a docstring that explain what the function does and what filters should be, possibly including an example;
2) I'd use "if not filters:" instead of "if filters == ():";
3) are there cases where the third arg of filterwarnings is not DeprecationWarning? If not, it's probably better to turn "filters" in a list of regex instead than a sequence of tuples like (regex, DeprecationWarning);
4) maybe silence_py3k_warning could yield an instance of WarningsRecorder, in case someone wants to access the silenced warnings.