def shout(msg, f=sys.stderr):
    print >> f, "{0}: {1}".format(_PROG, msg)
    f.flush()
Called when a pan operation has started.
dataset/ETHPy150Open axialmarket/fsq/libexec/fsq/add-host.py/shout--crossover with--dataset/ETHPy150Open ejeschke/ginga/ginga/mplw/transform.py/GingaAxes.start_pan