# File lib/spreadsheet/workbook.rb, line 80
    def inspect
      variables = (instance_variables - uninspect_variables).collect do |name|
        "%s=%s" % [name, instance_variable_get(name)]
      end.join(' ')
      uninspect = uninspect_variables.collect do |name|
        var = instance_variable_get name
        "%s=%s[%i]" % [name, var.class, var.size]
      end.join(' ')
      sprintf "#<%s:0x%014x %s %s>", self.class, object_id,
                                     variables, uninspect
    end