求arcgis10.1多个shp批量添加同一个字段py脚本内容，谢谢

import arcpy
arcpy.env.workspace='D:\\a1'
for i in arcpy.ListFeatureClasses('*.shp'):
    print(i)
 arcpy.AddField_management(i,field_name='name2',field_type='text',field_length=40,field_alias='hhaha')