如果python中单元格的长度为2，则在列中添加前导零

numbers = [1, 23, 4, 56]
formatted_numbers = [str(num).zfill(2) for num in numbers]
print(formatted_numbers)  # 输出: ['01', '23', '04', '56']

numbers = [1, 23, 4, 56]
formatted_numbers = ["{:02d}".format(num) for num in numbers]
print(formatted_numbers)  # 输出: ['01', '23', '04', '56']

numbers = [1, 23, 4, 56]
formatted_numbers = [f"{num:02d}" for num in numbers]
print(formatted_numbers)  # 输出: ['01', '23', '04', '56']

months = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]
formatted_months = [f"{month:02d}" for month in months]
print(formatted_months)  # 输出: ['01', '02', '03', '04', '05', '06', '07', '08', '09', '10', '11', '12']