New issue 125: add a {randomseed} substitution string
https://bitbucket.org/hpk42/tox/issue/125/add-a-randomseed-substitution-string
Chris Jerdonek:
It would be nice to expose a special substitution string called something like
{randomseed} that would generate a random integer value each time it is used.
This would be useful for example in cases like this:
setenv =
PYTHONHASHSEED = {randomseed}
An associated command-line option `--randomseed` to force it to a particular
value would also be good. See this [e-mail
thread](http://lists.idyll.org/pipermail/testing-in-python/2013-September/005679.html)
for background.
Note that to be consistent with supporting `--randomseed`, {randomseed} should
probably yield the same value every time it is used (e.g. if it appears more
than once in tox.ini). In other words, it is a global value established once
when tox is invoked.
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