# -*- coding: utf-8 -*-
import openpyxl, os, shutil, time
f="한국지역난방공사.xlsx"
mt0=os.path.getmtime(f)
shutil.copy2(f,"한국지역난방공사_backup_행높이17전.xlsx")
wb=openpyxl.load_workbook(f)
ws=wb.active
ws.sheet_format.defaultRowHeight=17
ws.sheet_format.customHeight=True
mx=ws.max_row
for r in range(1,mx+1):
    ws.row_dimensions[r].height=17
# mtime guard before save
if abs(os.path.getmtime(f)-mt0)>0.5:
    raise SystemExit("ABORT: file changed by another process")
wb.save(f)
# verify
wb2=openpyxl.load_workbook(f)
ws2=wb2.active
hs=set()
for r in range(1,ws2.max_row+1):
    hs.add(ws2.row_dimensions[r].height)
print("max_row",ws2.max_row,"distinct heights set:",hs,"default",ws2.sheet_format.defaultRowHeight)