Color property of plotly bar charts not working for me

Question

Hy
i’m trying to generate a Chart using plotly express and i just can’t get my head around how to apply the correct colours to the bar. (i need a specific color for 1 bar )
End result wanted
So far

i have a data set with a color colum, but no matter what hex/rgb/color i send it it comes out wrong (ex aquamarine comes out as some sort of orange)

   PROJECT_ID KEY_NAME KEY_DESCRIPTION KEY_VALUE   KEY_PARAM KEY_GROUP  KEY_ORDER
0        6147     MinQ         Minimum     6.94%   lightblue    Chart1          1
1        6147     LowQ  Lower quartile     7.22%   lightblue    Chart1          2
2        6147     MedQ          Median      7.5%  aquamarine    Chart1          3
3        6147     UppQ  Upper quartile     7.77%   lightblue    Chart1          5
4        6147     MaxQ         Maximum    18.05%   lightblue    Chart1          6

fig = px.bar(data.sort_values('KEY_ORDER'),x='KEY_DESCRIPTION', y='KEY_VALUE', **color='KEY_PARAM'**  title = v_title,text='KEY_VALUE',labels={"KEY_DESCRIPTION": " ","KEY_VALUE": " "  })

tried sending all types of css colors in hex/rgb/literals.
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Edit: I managed to get the colors right folowing amance’s advice

But it seems the order is somehow broken down in groups of color.

Asked By: Jarvis Popcorn

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Source

Answer 1

You can try updating the trace with what marker color you want

# Customize aspect
fig.update_traces(marker_color='rgb(158,202,225)', marker_line_color='rgb(8,48,107)', marker_line_width=1.5, opacity=0.6)

taken from here: https://plotly.com/python/bar-charts/

Answered By: rachelyw

Answer 2

You’re looking for color_discrete_map. See reference here.

fig = px.bar(data.sort_values('KEY_ORDER'),
             x='KEY_DESCRIPTION',
             y='KEY_VALUE',
             color='KEY_PARAM',
             color_discrete_map='identity',
             title = v_title,
             text='KEY_VALUE',
             labels={"KEY_DESCRIPTION": " ","KEY_VALUE": " " },
             category_orders={'KEY_DESCRIPTION': data.sort_values('KEY_ORDER')['KEY_DESCRIPTION'])

I’d advise that you change the percentages in your KEY_VALUE column to floats (without the "%") so that each bar can be accurately plotted. You’ll be able to update the format on the figure later to show it as a percentage.

Answered By: amance

Color property of plotly bar charts not working for me

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