Example of how to override the bar chart color with plotly.express

[chriddyp]

https://plot.ly/python/bar-charts/

[emmanuelle]

Which syntax do you prefer @chriddyp @nicolaskruchten ?

import plotly.express as px
data_canada = px.data.gapminder().query("country == 'Canada'")
fig = px.bar(data_canada, x='year', y='pop', color_discrete_sequence=["red"])
fig.show()

or

import plotly.express as px
data_canada = px.data.gapminder().query("country == 'Canada'")
fig = px.bar(data_canada, x='year', y='pop')
fig.update_traces(marker_color='red')
fig.show()

Both have their pros and cons: the one-liner in px is nice, but it's also good to show people they can update traces and layout after calling px. I slightly prefer the 1st (all-px), but interested in your opinion.

[emmanuelle]

Also add an example in the box-plots tutorial.

And related to #2119.

[AtharvaKatre]

@emmanuelle is it possible to add a Continuous color scale like 'Viridis' to a bar plot?

[gvwilson]

Hi - we are trying to tidy up the stale issues and PRs in Plotly's public repositories so that we can focus on things that are still important to our community. Since this one has been sitting for several years, I'm going to close it; if it is still a concern, please add a comment letting us know what recent version of our software you've checked it with so that I can reopen it and add it to our backlog. Thanks for your help - @gvwilson