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Without width=width, the code would not run (as format would have no idea what {width} should be set to.
If you're asking what it does, then it tells the format function to set all {width} parts parameter to the width variable defined at line 2.
If you're asking why {width} is there, then it tells format to space out the output of each number to the largest number string (which is found out by line 2 of the code).
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Without
width=width, the code would not run (asformatwould have no idea what{width}should be set to.If you're asking what it does, then it tells the
formatfunction to set all{width}parts parameter to thewidthvariable defined at line 2.If you're asking why
{width}is there, then it tellsformatto space out the output of each number to the largest number string (which is found out by line 2 of the code).