I am trying to update a context from onchange method. Below is code reference-

@api.onchange('country')
def country(self):
    """verify country."""

    self = self.with_context(flag = True)

@api.onchange('state')
def state(self):
    """verify state."""

    print self.env.context

When def country is called i am able to print flag=True in context But when def state method is called i m unable to get flag=True

Also below if my xml code to hide field using context

field name="productname" invisible="context.get('flag', True)"

But flag=True unable to locate under context!!

How i can fix it?