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[Chareyre <bruno.chareyre@xxxxxxxxxxxxxxx>]

Do you understand why your explanation apply only if there is no run() 
in the script?
If you uncomment the "run" (second line from the end), it will behave 
differently (which is why periodic-triax.py handles phase transitions 
correctly by default, removing run from the script will break the process).

-- 
problem with python globals
https://bugs.launchpad.net/bugs/588387
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Status in Yet Another Dynamic Engine: Invalid

Bug description:
As discussed in yade-dev list. Python globals will behave differently if there is a run() in the invoked script or not.

Here is a script. If you run it straightaway, it will print :

"refstrain= 2.0  (should be 2.0), phase= 1  (should be 1)"

Now, comment the two last lines and run it again (clicking "play" for instance, until it stops automatically or as soon as you see "Now εz will go from 0 to .2" output). Typing  "print refstrain,phase" will then return : 0.0 0, as if the "global" directive was ignored.