ArcGIS Python 脚本界面控制

import arcpyclass ToolValidator(object):  """Class for validating a tool's parameter values and controlling  the behavior of the tool's dialog."""
  def __init__(self):    """Setup arcpy and the list of tool parameters."""    self.params = arcpy.GetParameterInfo()
  def initializeParameters(self):    """Refine the properties of a tool's parameters.  This method is    called when the tool is opened."""    return
  def updateParameters(self):    if self.params[0].value:      self.params[1].value = self.params[0].value + "_ok"    return
  def updateMessages(self):    """Modify the messages created by internal validation for each tool    parameter.  This method is called after internal validation."""    return