[Python-Dev] peps: Update PEP 399 to include comments from python-dev. (original) (raw)

Georg Brandl g.brandl at gmx.net
Wed Apr 13 08:54:00 CEST 2011

On 13.04.2011 02:07, Antoine Pitrou wrote:

On Tue, 12 Apr 2011 19:50:34 -0400 Tres Seaver <tseaver at palladion.com> wrote:

Trying to accelerate existing code which doesn't have the coverage is insane: how can you know that the accelerator doesn't subtly change the semantics without tests? Well, why do you think tests guarantee that the semantics are the same? Tests are not a magic bullet. "Covering" a code path doesn't ensure that every possible behaviour is accounted for.

def foo(a, b): if condition(a): bar = b do_something_with(bar)

This has 100% coverage if "condition" is usually true :)

Georg

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