def zoom(ax, xy='x', factor=1):
    """Zoom into axis.

    Parameters
    ----------
    """
    limits = ax.get_xlim() if xy == 'x' else ax.get_ylim()
    new_limits = (0.5*(limits[0] + limits[1])
                  + 1./factor * np.array((-0.5, 0.5)) * (limits[1] - limits[0]))
    if xy == 'x':
        ax.set_xlim(new_limits)
    else:
        ax.set_ylim(new_limits)
def zoom ( ax , xy = 'x' , factor = 1 ) : limits = ax . get_xlim ( ) if xy == 'x' else ax . get_ylim ( ) new_limits = ( 0.5 * ( limits [ 0 ] + limits [ 1 ] ) + 1. / factor * np . array ( ( - 0.5 , 0.5 ) ) * ( limits [ 1 ] - limits [ 0 ] ) ) if xy == 'x' : ax . set_xlim ( new_limits ) else : ax . set_ylim ( new_limits )
Zoom into axis.

    Parameters
    ----------