python - 在 ArcGis 上使用 Python 的 UnboundLocalError

Question

我正在研究 ArcMap，我有这个 python 代码：

import arcpy, sys

feature = arcpy.GetParameterAsText(0)


def nearRoutine():
    #calculate the distances using the current dataset
    arcpy.Near_analysis(feature, feature)

    #iterate through any features which are within the distance
    cur = arcpy.UpdateCursor(feature, '"NEAR_DIST" < 500')
    row1 = cur.next()
    while row1:

        #this point is within the distance of its neighbor, so delete it
        cur.deleteRow(row1)

        #now re-run this routine on the new dataset
        del row1, cur
        nearRoutine

#call the recursive routine. It will get progressively faster to run as it will loop through fewer points each time
nearRoutine()

我的错误信息：UnboundLocalError: local variable 'row1' referenced before assignment

我不明白，因为我的变量已明确定义...

有人有问题吗？

Answer 1

您删除row1然后继续迭代要求（检查）它！

我不确定你是否真的需要del在你的变量row1或cur你拥有它的地方使用它。您正在删除这些变量，而不是它们在数据结构中的内容。