[TIP] question re: tox and PYTHONHASHSEED

Chris Jerdonek chris.jerdonek at gmail.com
Wed Sep 25 18:29:49 PDT 2013

On Wed, Sep 25, 2013 at 3:53 PM, Chris Jerdonek
<chris.jerdonek at gmail.com> wrote:
> I have a question about tox.  What options do I have for setting
> PYTHONHASHSEED [1] to an explicit random integer value prior to each
> tox test run?

By the way, I tried the following two work-arounds in my tox.ini, and
neither worked:

commands =
    export PYTHONHASHSEED=$RANDOM && run_tests

py33 runtests: commands[0] | export PYTHONHASHSEED=$RANDOM && run_tests
ERROR: InvocationError: could not find executable 'export'

commands =
    echo "foo" && export PYTHONHASHSEED=$RANDOM && run_tests

py33 runtests: commands[0] | echo foo && export PYTHONHASHSEED=$RANDOM
&& run-tests
WARNING:test command found but not installed in testenv
  cmd: /bin/echo
  env: /.../.tox/py33
Maybe forgot to specify a dependency?
foo && export PYTHONHASHSEED=$RANDOM && run-tests

In the latter example, it is "echoing" the rest of the command.


> Specifically, my tox command calls a Python test script generated from
> a setup.py console_script entry_point.  For debugging purposes, my
> test script displays the value of PYTHONHASHSEED at the beginning of
> each test run.  If PYTHONHASHSEED is an integer as opposed to
> "random", this lets me re-run the tests with the same hash seed.
> I would like to set PYTHONHASHSEED to a random integer for each tox
> test run.  When running tests from source (without tox), I can do this
> using a wrapper shell script that sets PYTHONHASHSEED as follows prior
> to calling the Python script:
> What options do I have for doing something similar with tox?  For
> example, it would be nice to be able to do something like the
> following in my tox.ini:
>     setenv =
> --Chris
> [1] http://docs.python.org/2/using/cmdline.html#envvar-PYTHONHASHSEED

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