Unable to save wb with 3D bar chart from openpyxl example
*Created originally on Bitbucket by [USN_SHIPWRECK (jeremy turner)](https://bitbucket.org/%7Beaab88aa-2fa4-4c77-be1f-979abd001bdd%7D/)* Hello, I have been using openpyxl to edit xlsx files that have charts. I recently came across a file that has a 3D Bar Chart in it. When i tried to save the workbook, openpyxl gave me an error: ``` #!python expected <class 'openpyxl.chart._3d.View3D'> ``` Looking into this i noticed that chart.view3D was of type: ``` #!python openpyxl.descriptors.base.Typed ``` I thought maybe this was an issue with the file i was working on, so i looked up how to use 3d bar charts in the openpyxl docs. I followed the [instructions on how to build a simple 3D bar chart](https://openpyxl.readthedocs.io/en/stable/charts/bar.html#d-bar-charts) and, when trying to save that test workbook, i got the same error: ``` #!python expected <class 'openpyxl.chart._3d.View3D'> ``` is there a solution for this issue or a ticket already submitted? My current working solution is to copy the series, category, title,legend, etc from the 3D bar chart and copy them into 2d bar chart object that i use to replace the 3d bar chart. I have attached the test 3d bar chart file that simply load and then try to save. Here is the code for the test 3d bar chart that produces the error: ``` #!python from openpyxl import Workbook from openpyxl.chart import ( Reference, Series, BarChart3D, ) wb = Workbook() ws = wb.active rows = [ (None, 2013, 2014), ("Apples", 5, 4), ("Oranges", 6, 2), ("Pears", 8, 3) ] for row in rows: ws.append(row) data = Reference(ws, min_col=2, min_row=1, max_col=3, max_row=4) titles = Reference(ws, min_col=1, min_row=2, max_row=4) chart = BarChart3D() chart.title = "3D Bar Chart" chart.add_data(data=data, titles_from_data=True) chart.set_categories(titles) ws.add_chart(chart, "E5") wb.save("bar3d.xlsx") ``` *Attachments:* [3d_bar_chart_test.xlsx](/uploads/7b9511971624a163f6f3865ec1befd0f/3d_bar_chart_test.xlsx)
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