Question

我意识到这是帖子的常见主题，但是，我似乎无法找到一个真正帮助我解决问题的例子。我正在尝试运行一个脚本，它将向shapefile添加两个新字段（x和y coords），然后使用代码块用X和Y coords填充这些字段。这适用于AcrGIS 10.2.2，但我不认为问题是ArcGIS问题。下面的脚本：

# Add new fields for "New_X" and "New_Y" for new points to be added
# Calculate values for those new fields based on distance along line
import arcpy, arcpy.mapping
from arcpy import env
env.workspace = r"G:\Geocomputation_Project\Section_C\Model_Shapes"
env.overwriteOutput = True

# Set local Variables
in_table = 'Points.shp'
field_x = 'New_X'
field_y = 'New_Y'
expression = "getXY(!Shape!, !ITEMID!, !CHAINAGE!)"
code_block_x = """def getXY (point, id, d2add):
mxd = arcpy.mapping.MapDocument("G:\Geocomputation_Project\Section_C\Model_Shapes\Geocomputation_Project.mxd")
lyr=arcpy.mapping.ListLayers(mxd,"LINES")[0]
q='"ITEMID"=%s%s%s' %(r"'",id,"'")
pNew = 0
with arcpy.da.SearchCursor(lyr,"Shape@",q)as cursor:
    for row in cursor:
        line=row[0];break
        pointPos=line.measureOnLine(point)+d2add
        pNew+=line.positionAlongLine(pointPos).firstPoint
pNew.X"""
code_block_y = """def getXY (point, id, d2add):
mxd =  arcpy.mapping.MapDocument("G:\Geocomputation_Project\Section_C\Model_Shapes\Geocomputation_Project.mxd")
lyr=arcpy.mapping.ListLayers(mxd,"LINES")[0]
q='"ITEMID"=%s%s%s' %(r"'",id,"'")
pNew = 0
with arcpy.da.SearchCursor(lyr,"Shape@",q)as cursor:
    for row in cursor:
        line=row[0];break
        pointPos=line.measureOnLine(point)+d2add
        pNew+=line.positionAlongLine(pointPos).firstPoint
pNew.Y"""

# Execute AddField for each new X and Y coord
arcpy.AddField_management(in_table, field_x, "Double")
arcpy.AddField_management(in_table, field_y, "Double")

# Execute CalculateField to each new X and Y field
arcpy.CalculateField_management(in_table, field_x, expression,  "PYTHON_9.3", code_block_x)
arcpy.CalculateField_management(in_table, field_y, expression, "PYTHON_9.3", code_block_y)

我一直得到AttributeError：'int'对象没有属性'X'。

Answer 1

假设标题中的错误是正确的，而不是帖子正文中的错误，那么这就是您的问题：

pNew = 0
# ...
pNew.Y

很明显，这不会起作用

Answer 2

我现在知道了，似乎还有更多的语法/缩进错误。还需要“返回”pNew变量。见下面的工作脚本：

code_block_x = """def getXY (point, id, d2add):
mxd = arcpy.mapping.MapDocument("G:\Geocomputation_Project\Section_C\Model_Shapes\Geocomputation_Project.mxd")
lyr=arcpy.mapping.ListLayers(mxd,"LINES")[0]
q='"ITEMID"=%s%s%s' %(r"'",id,"'")
with arcpy.da.SearchCursor(lyr,"Shape@",q)as cursor:
    for row in cursor:
        line=row[0];break
pointPos=line.measureOnLine(point)+d2add
pNew=line.positionAlongLine(pointPos).firstPoint
return pNew.X"""

和

code_block_y = """def getXY (point, id, d2add):
mxd = arcpy.mapping.MapDocument("G:\Geocomputation_Project\Section_C\Model_Shapes\Geocomputation_Project.mxd")
lyr=arcpy.mapping.ListLayers(mxd,"LINES")[0]
q='"ITEMID"=%s%s%s' %(r"'",id,"'")
with arcpy.da.SearchCursor(lyr,"Shape@",q)as cursor:
    for row in cursor:
        line=row[0];break
pointPos=line.measureOnLine(point)+d2add
pNew=line.positionAlongLine(pointPos).firstPoint
return pNew.Y"""

AttributeError：'int'对象没有属性'x'

2 个答案: