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Date picker for sales data

The interactive sales dashboard you created was a smash hit; however, it is vital for the sales team to be able to monitor daily sales to analyze patterns and trends. You have been asked if you can extend your work to include a filter to view sales by major category on a particular date?

This sounds like a job for a date picker!

说明

100 XP

Create a date picker component called dcc.DatePickerSingle with the identifier sale_date below line 18.
Set the date parameter to April 11, 2011 below line 23 to show this as the initial visible date.

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