写一个arcgis工具箱脚本：除Object ID，Shape 和 Shape_Length/Shape_Area 字段外，用来删除数据的其他所有字段

下面是一个简单的ArcGIS工具箱脚本，可以实现删除指定要素类中除Object ID、Shape和Shape_Length/Shape_Area字段外的所有字段：

import arcpy

class Toolbox(object):
    def __init__(self):
        self.label = "Delete Fields Except OID and Shape"
        self.alias = "Delete Fields Except OID and Shape"
        self.tools = [DeleteFields]

class DeleteFields(object):
    def __init__(self):
        self.label = "Delete Fields Except OID and Shape"
        self.description = "Deletes all fields except Object ID, Shape, and Shape_Length/Shape_Area."
        self.canRunInBackground = False

    def getParameterInfo(self):
        fc_param = arcpy.Parameter(
            displayName="Feature Class",
            name="fc",
            datatype="DEFeatureClass",
            parameterType="Required",
            direction="Input")

        return [fc_param]

    def execute(self, parameters, messages):
        fc = parameters[0].valueAsText

        # Get a list of all fields in the feature class
        fields = arcpy.ListFields(fc)

        # Create a list of field names to delete
        field_names = []
        for field in fields:
            if field.name not in ["OBJECTID", "SHAPE", "SHAPE_Length", "SHAPE_Area"]:
                field_names.append(field.name)

        # Delete the fields
        arcpy.DeleteField_management(fc, field_names)

        messages.addMessage("Fields deleted: {}".format(", ".join(field_names)))

使用方法：

1. 将上述代码保存为一个.py文件，例如`DeleteFieldsExceptOIDandShape.py`；
2. 在ArcGIS中创建一个新的工具箱（或打开一个现有的工具箱）；
3. 右键单击工具箱，选择“添加工具”；
4. 在“添加新工具”对话框中，选择“脚本”类型，输入一个名称，例如“Delete Fields Except OID and Shape”；
5. 在“脚本”选项卡中，选择上述保存的.py文件；
6. 在“参数”选项卡中，添加一个“Feature Class”参数，并设置为“DEFeatureClass”类型，必填；
7. 保存工具箱。

现在你可以在ArcGIS中使用该工具箱，选择要素类并运行工具来删除除Object ID、Shape和Shape_Length/Shape_Area字段之外的所有字段。