python TypeError: unsupported operand type(s) for +: 'geoprocessing value object' and 

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python TypeError: unsupported operand type(s) for +: 'geoprocessing value object' and 'str'

TypeError: unsupported operand type(s) for +: 'geoprocessing value object' and 'str' 
 if self.params[0].value:
        mypath=self.params[0].value #
        cpath=mypath+os.sep+dataset
        arcpy.env.workspace =cpath
修改如下：
 if self.params[0].value:
        mypath=str(self.params[0].value) #
        cpath=mypath+os.sep+dataset
        arcpy.env.workspace =cpath

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