方法一，利用 sheet.iter_rows() 獲取 Sheet1 表中的所有行，然後遍歷

import openpyxl
wb = openpyxl.load_workbook('example.xlsx')
sheet = wb.get_sheet_by_name('Sheet1')
for row in sheet.iter_rows():
	for cell in row:
		print(cell.coordinate, cell.value)
print('--- END OF ROW ---')

sheet = wb.get_sheet_by_name('Sheet1')
for rowOfCellObjects in sheet['A1':'C3']:
	for cellObj in rowOfCellObjects:
		print(cellObj.coordinate, cellObj.value)
print('--- END OF ROW ---')