代码示例：
#获取句子长度
sentence = input('Plese input a sentence:')#He's very naughty boy
screen_width =100
#获取文本的长度
text_width =len(sentence)
#文本的宽度
box_width = text_width +10
#计算出左右两边需空余的格式数[左边缘，右边缘]
left_margin = (screen_width - box_width)//2
box_left_margin = (box_width-text_width)//2
#打印屏幕宽度
print('='*100)
print(' '*left_margin + '+' + '-' *(box_width-2) + '+')
print(' '*left_margin + '|' + ' ' *(box_width-2) + '|')
print(' '*left_margin + '|' + ' '*(box_left_margin-1) + sentence + ' '*(box_left_margin-1) + '|')
print(' '*left_margin + '|' + ' ' *(box_width-2) + '|')
print(' '*left_margin + '+' + '-' *(box_width-2) + '+')
#打印屏幕宽度
print('='*100)
运行结果：
Plese input a sentence:I love you Fiona
====================================================================================================
+------------------------+
| |
| I love you Fiona |
| |
+------------------------+
====================================================================================================