And for those who missed the announcement, plotly is now an open source library (it used to be a web service where you needed an API key and had to upload data to their servers, etc.) You still get all the "polish" (nice docs, consistent API, examples, etc.) that went into it when it was a commercial product.
Thanks for this! I dropped plotly due to having projects on machines wtihout an internet connection. Have to try it again.