HowTo:  Calculate unique identifier values similar to Global IDs

【解决方案】
1.A unique identifier can be calculated using the UUID (Universally Unique Identifier) Python module. The resulting string value can be modified to match the same format as the Global ID by applying an uppercase function with the addition of curly brackets.
2.Add a new field to the feature class. A GUID field type can only be added to a geodatabase feature class, and a text field type can be added to a shapefile. 
   A text field requires a length of 38 characters to store the identifier, dashes, and brackets.
Open the Field Calculator, choose the Python parser, and check the option to Show Codeblock. 
  

def ID():

  import uuid

  return '{' + str(uuid.uuid4()) + '}'

  

GUID=ID()

3.The unique value is calculated for each row: 

【其它相关参考】

1. Python UUID Module
2. ArcGIS field data types

【创建及修改时间】
Created: 11/19/2012

Last Modified: 7/12/2013
【原文链接】
http://support.esri.com/en/kno ... 40668