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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def pprint_value_string(self, value):
 """Pretty print the dimension value and unit. Args: value: Dimension value to format Returns: Formatted dimension value string with unit """

        unit = '' if self.unit is None else ' ' + bytes_to_unicode(self.unit)
        value = self.pprint_value(value)
        return title_format.format(name=bytes_to_unicode(self.label), val=value, unit=unit)