[Python-ideas] Runtime assertion with no overhead when not active
steve at pearwood.info
Tue May 8 11:39:49 EDT 2018
On Tue, May 08, 2018 at 09:58:51AM -0400, Eric V. Smith wrote:
> I think what's confusing to me (and maybe others) is that we haven't
> seen your vision on how this would look in Python code.
> An example that would throw runtime assertions and the same example
> where it wouldn't (after a global switch is set?) would be helpful.
In Eloi's first post in this thread, he gave the example:
runtime_assert( expr )
Although it is written as a function call, he refers to it as a
statement, so I guess he means:
He says that would compile to the equivalent of:
if runtime_assert_active and expr:
but he gives no idea of what runtime_assert_active is (is it a
per-module global variable? a single application-wide super-global? a
local variable? something else?) or how we are supposed to set it.
Nor does he explain why failed assertions merelt *print* an error
message, rather than raising an exception.
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