Matplotlib Bar Chart choose color if value is positive vs value is negative

Question

I have a pandas DataFrame with positive and negative values as a bar chart. I want to plot the positive colors \'green\' and the negative values \'red\' (very original...lol

Answer 1

Define

def bar_color(df,color1,color2):
    return np.where(df.values>0,color1,color2).T

then

data.plot.barh(color=bar_color(data,'r','g'))

gives

It also works for multiple bar series

df=pd.DataFrame(np.random.randint(-10,10,(4,6)))
df.plot.barh(color=bar_color(df,'r','g'))

gives