You could use the dirty callback to know that the connected plug has
changed, even though it hasn't evaluated yet. And then defer actually
handling its new value until after evaluation.

from maya import cmds, OpenMaya, utils
def handle_attr(attr):
    print '-- Attribute {0} Changed: {1}'.format(attr, cmds.getAttr(attr))
def cb(msg, plug, *args, **kwargs):
    print '-- Attribute {0} Dirty'.format(plug.name())
    utils.executeDeferred(handle_attr, plug.name())




On Wed, Aug 5, 2020 at 9:40 PM Rémi Deletrain <remi.deletr...@gmail.com>
wrote:

> In fact I recive the value before attribute change.
>
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