Auto-answer to my own message : I got time to look arround myself and got 
some success.


Execute the following Maya script :

testVar=5
cmds.scriptNode( n='test script node R', bs='print "current time is %f" 
%maya.cmds.currentTime(q=1); print "value of testVar : %i" %testVar;', 
st=7, stp='python' )

Note that the "st" flag is 7 => "Execute on time changed"
(see 
http://download.autodesk.com/global/docs/maya2014/en_us/CommandsPython/scriptNode.html#flagbeforeScript
 
for the documentation of the script Node Command)



Then play the animation. 
It outputs :

current time is 1.000000
value of testVar : 5
current time is 2.000000
value of testVar : 5

... and so forth.


Rational : 
1/ python script node has access to the interpreter's global variables
2/ when set as "Execute on time changed", a script node is not auto-deleted 
once executed.

just the behaviour we were looking for.

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