FieldExists

import arcpy

import os

import sys

def FieldExists(TableName,FieldName):

    desc = arcpy.Describe(TableName)

    for field in desc.fields:

        if field.Name.upper() ==FieldName:

            return True

            break

    return False

TableName= arcpy.GetParameterAsText(0) #第一个输入参数

FieldName = arcpy.GetParameterAsText(1) #第二个输入参数

FieldName=FieldName.upper()

b=FieldExists(TableName,FieldName)

arcpy.AddMessage("TableName:"+TableName+",FieldName:"+FieldName+","+str(b))

arcpy.SetParameter(2, b) #输出参数是第三个