arcpy-字段唯一值、重复值、最值、平均值、方差、标准差、中数、众数

插个广告，制作ArcGIS的Tool工具学习下面的教程就对了：

零基础学习Python制作ArcGIS自定义工具观看链接

《零基础学习Python制作ArcGIS自定义工具》课程简介

 import arcpy
 import numpy
 from arcpy import da

 def GetFieldUniqueValue(inTable,inField):
     value_list=[]
     rows=arcpy.da.SearchCursor(inTable,inField)
     for row in rows:
         if row[0] not in value_list:
             value_list.append( str(row[0]).decode('utf-8') )
     del row
     del rows
     return value_list

 def GetDuplicateValue(inTable,inField):
     dic={}
     rows=arcpy.da.SearchCursor(inTable,inField)
     for row in rows:
         if row[0] in dic.keys():
             dic[row[0]]=dic[row[0]]+1
         else:
             dic[row[0]]=1
     del row
     del rows
     for key,value in dic.items():
         if value==1:
             del dic[key]
     return dic

 def GetFieldMode(inTable,inField):
     dic=GetDuplicateValue(inTable,inField)
     lst=[value for key,value in dic.items()]
     num=max(lst)
     modeList=[]
     for key,value in dic.items():
         if value==num:
             modeList.append(key)
     return modeList

 def GetFieldValueList(inTable,inField):
     value_list=[]
     rows=arcpy.da.SearchCursor(inTable,inField)
     for row in rows:
         value_list.append(row[0])
     del row
     del rows
     return value_list

 def main():
     in_fc=arcpy.GetParameterAsText(0)
     in_fld=arcpy.GetParameterAsText(1)
     c=arcpy.GetParameterAsText(2)
     if c== "Unique value":
         uniqueValue=GetFieldUniqueValue(in_fc,in_fld)
         arcpy.AddMessage("Unique Value:")
         for i in uniqueValue:
             arcpy.AddMessage(str(i))
     if c=="Duplicate value":
         duplicateValue= GetDuplicateValue(in_fc,in_fld)
         arcpy.AddMessage("Duplicate Value,Count:")
         for key,value in duplicateValue.items():
             arcpy.AddMessage("{0},{1}".format(key,value))
     if c=="Max/Min/Sum/Average etc.":
         valueList=GetFieldValueList(in_fc,in_fld)
         arcpy.AddMessage("Field Name:{}".format(in_fld))
         arcpy.AddMessage("Max:{}".format(max(valueList)))
         arcpy.AddMessage("Min:{}".format(min(valueList)))
         arcpy.AddMessage("Sum:{}".format(sum(valueList)))
         arcpy.AddMessage("Average:{}".format(numpy.mean(valueList)))
         arcpy.AddMessage("Median:{}".format(numpy.median(valueList)))
         arcpy.AddMessage("Mode:{}".format(GetFieldMode(in_fc,in_fld)))
         arcpy.AddMessage("Variance:{}".format(numpy.var(valueList)))
         arcpy.AddMessage("Standard Deviation:{}".format(numpy.std(valueList)))