Small box algorithm----statement written in the box centered

The following code function is: No matter how long you enter a sentence, you can build the corresponding size box and the statement is centered in the box ...

#!/usr/bin/env python# definition sentence = raw_input ("sentence: ") screen_with = 80text_ Width = len (sentence) box_width = text_width + 6left_margin =  (screen_ with - text_width)  // 2# picture box printprint  '   '  * left_margin +  ' + '  +  '-'  * box_width +  ' + ' print  '   '  * left_margin +   ' | '  +  '   '  * box_width +  ' | ' print  '   '  * left_margin +  ' | '  +  '   '  *  ((box_width - text_width)  // 2)   +  sentence  +  '   '  *  ((box_width - text_width)  // 2)  +   ' | ' print  '   '  * left_margin +  ' | '  +  '   '  * box_width +  ' | ' print  '   '  * left_margin +  ' + '  +  '-'  * box_width +  ' + ' Print 

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Small box algorithm----statement written in the box centered