%matplotlib inline
from ggplot import *

scale_y_reverse

scale_y_reverse reverses your y-axis. Its parameters are:

ggplot(diamonds, aes(x='price', y='carat')) + \
    geom_point() + \
    scale_y_reverse()

<ggplot: (284494033)>

ggplot(pigeons, aes(x='speed')) + \
    geom_histogram() + \
    scale_y_reverse()

<ggplot: (285315485)>

ggplot(pigeons, aes(x='speed', y='pos')) + \
    geom_line() + \
    scale_y_reverse()

<ggplot: (285437269)>

ggplot(pigeons, aes(x='speed', y='pos')) + \
    geom_line() + \
    scale_x_reverse() + \
    scale_y_reverse()

<ggplot: (285646601)>