<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def image_shift(xshift=0, yshift=0, axes="gca"):
 """ This will shift an image to a new location on x and y. """


    if axes=="gca": axes = _pylab.gca()

    e = axes.images[0].get_extent()

    e[0] = e[0] + xshift
    e[1] = e[1] + xshift
    e[2] = e[2] + yshift
    e[3] = e[3] + yshift

    axes.images[0].set_extent(e)

    _pylab.draw()