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Python OpenpyxlでExcelファイルが壊れるのはオブジェクトが非表示で混入している

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PythonでOpenpyxlでExcelファイルを読み書きする時、Excelファイルが壊れるときがあります。
原因は、オブジェクト(図形とか)が非表示で残っているからです。
ところが、やっかいなのはホーム-編集-検索と選択-オブジェクトの選択と表示(P)でも表示されないところです。そこで、VBAでVisible=False の Shapesをvisibleにして削除するようにします。

VisibleObject
Sub VisibleShapes()
    Dim spShape As Shape
    Dim spCnt As Long
    For Each spShape In ActiveSheet.Shapes
      If spShape.Visible = False Then
        spShape.Visible = True
        spCnt = spCnt + 1
      End If
    Next
      If spCnt <> 0 Then
        MsgBox spCnt & "個の名前定義が見つかりました。", vbInformation
      Else
        MsgBox "非表示の図形はありません。", vbExclamation
      End If
End Sub
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