[TIP] coverage - conditionally exclude code?

[Ned Batchelder]

On 6/5/15 10:59 AM, Albert-Jan Roskam wrote:
>
> Hello,
>
> Is it possible to conditionally exclude bits of code from coverage measurements?
> For example:
> -under Python 2, can I exclude Python-3-only pieces of code?
> -under Linux, can I exclude Windows-specific functions?
>
>
> I have been looking here, but it does not appear to be possible:
>
> http://nedbatchelder.com/code/coverage/excluding.html#excluding
> The only way I can think of is by somehow dynamically adjusting the exclude_lines in .coveragerc
The first thing to consider is not doing version-specific exclusion at 
all.  Run your tests under all your scenarios, combine the coverage 
results, and produce a coverage report.  Doing this, you don't need to 
exclude anything for specific versions.

If you really do want version-specific exclusions: The best way we've 
come up with is to use a number of .coveragerc files. Each can define 
"[report] exclude_lines" slightly differently.  So .coveragerc_py3 could 
have an exclude_lines with "# pragma: no cover" and "# pragma: no py3", 
etc.  Then you can use "# pragma: no py3" to exclude lines that won't be 
run under Python 3.

--Ned.