def score_stretch(self, stretch1, stretch2):
try:<EOL><INDENT>stretchval1 = int(stretch1)<EOL><DEDENT>except ValueError:<EOL><INDENT>stretchval1 = stretch_dict.get(stretch1, <NUM_LIT>)<EOL><DEDENT>try:<EOL><INDENT>stretchval2 = int(stretch2)<EOL><DEDENT>except ValueError:<EOL><INDENT>stretchval2 = stretch_dict.get(stretch2, <NUM_LIT>)<EOL><DEDENT>return abs(stretchval1 - stretchval2) / <NUM_LIT><EOL>
Returns a match score between *stretch1* and *stretch2*.

The result is the absolute value of the difference between the
CSS numeric values of *stretch1* and *stretch2*, normalized
between 0.0 and 1.0.