gis属性表怎样自动赋值自然数或字母顺序

<pre t="code" l="python">rec=0
def autoIncrement():
global rec
pStart = 1
pInterval = 1
if (rec == 0):
rec = pStart
else:
rec = rec + pInterval
return rec这是python代码，然后在字段里输入autoIncrement()即可

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