pandas plot dataframe barplot with colors by category

Question

I would like to use pandas to plot a barplot with diffrent colors for category in column.

Here is a simple example: (index is variable)

df:
                  


        

Answer 1

Just pass a color parameter to the plot function with a list of colors:

df['group'].plot(kind='bar', color=['r', 'g', 'b', 'r', 'g', 'b', 'r'])

If you want to plot the value as bars and you also want the group to determine the color of the bar, use:

colors = {1: 'r', 2: 'b', 3: 'g'}
df['value'].plot(kind='bar', color=[colors[i] for i in df['group']])

You can also use something like:

list(df['group'].map(colors))

Instead of the list comprehension.