python openpyxl insert_cols changes merge-cells and styles

Question

I tried to insert a column into an excel.

However, the style of cells has been changed

CODE:

import openpyxl

wb = openpyxl.load_workbook('xt3.xlsx')
sheet = wb.worksheets[0]

sheet.insert_cols(0)
[enter image description here][1]wb.save("filename.xlsx")

https://i.stack.imgur.com/hl5QY.png

issues on bitbucket: https://bitbucket.org/openpyxl/openpyxl/issues/1098/bugs-insert_cols-changes-merge-cells-and

Answer 1

This code will insert 3 columns; It keeps the background color but not all of the borders.

merged_cells_range = ws.merged_cells.ranges
for merged_cell in merged_cells_range:
    merged_cell.shift(3,0)
ws.insert_cols(1,3)

Answer 2

After some digging I wrote this code in openpyxl and xlrd/xlwt/xlutils. Support both xls and xlsx.

Before

After

The key is to use copy and generate coordinate. Code is here