Arcpy 随机选取部分要素并导出

# Import system modules
import arcpy, os, time
import random
from arcpy import env
print '程序开始：' + str(time.ctime())
# Set environment settings
env.workspace = "D:pythonlearint.gdb"
# Set local variables
inFeatures = "毕节市矢量图1228"
fieldName1 = "RD"
fieldPrecision = 9
fieldAlias = "随机数字"
# Execute AddField
arcpy.AddField_management(inFeatures, fieldName1, "DOUBLE", fieldPrecision, "", "",
fieldAlias, "NULLABLE")
field1 = "RD"
cursor = arcpy.UpdateCursor(inFeatures)
for row in cursor:
# 随机赋值
row.setValue(field1, random.random())
cursor.updateRow(row)
#导出选择的数据集
arcpy.MakeFeatureLayer_management(inFeatures, "lyr")
arcpy.SelectLayerByAttribute_management("lyr", "NEW_SELECTION", ' "RD" < 0.05 ')
# Write the selected features to a new featureclass
arcpy.CopyFeatures_management("lyr", "RD_Train")
print '程序结束：' + str(time.ctime())

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