錯誤處理Python arcpy腳本需要的建議

我可以使用一些關於如何處理Python腳本中的錯誤的建議。從閱讀本網站上的所有Python錯誤處理帖子所能獲得的信息是，您不能簡單地繞過for循環中的錯誤，並嘗試使用continue語句。相反，你必須直接處理每個錯誤。這是我遇到問題的地方。我附加了發生在for循環中間的錯誤消息。此外，我重視我的腳本，通過以下流程移動：錯誤處理Python arcpy腳本需要的建議

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夾根據所選擇的縣多邊形

如何incorporat光柵e將錯誤信息中的信息轉換爲除continue語句之外的try，以便腳本可以移動到列表中的下一個柵格，而不是在處理過程中停止？

# Import arcpy module 
import arcpy 
from arcpy import env 
from arcpy.sa import * 
arcpy.CheckOutExtension("3D") 

# Set Over write 
arcpy.env.overwriteOutput = 1 

# Set the workspace 
env.workspace = r"Z:\temp.gdb" 
outworkspace = r"Z:\location2\temp2.gdb" 

# Local variables: 
counties = r"Z:\temp.gdb\boundaries\Counties" 
counties_lyr = arcpy.MakeFeatureLayer_management(counties,"counties_lyr") 

# Get the list of rasters to process 
raster_list = arcpy.ListRasters("*_clp") 
print raster_list 

for raster in raster_list: 
    # Define name and location for output raster 
    name = outworkspace + "\\" + str(raster) 

    # Process: Raster Domain 
    arcpy.RasterDomain_3d(raster, "in_memory/temp", "POLYGON") 

    # Process: Central Feature 
    arcpy.MeanCenter_stats("in_memory/temp", "in_memory/temp1") 

    # Process: Select Layer By Location 
    arcpy.SelectLayerByLocation_management(counties_lyr, "intersect", "in_memory/temp1", "", "NEW_SELECTION") 

    # Clip Raster 
    arcpy.Clip_management(raster, "#", name,counties_lyr, "#", "ClippingGeometry") 

    # Delete in_memory 
    arcpy.Delete_management("in_memory") 

    print "processing " + raster + " complete..." 

print "All processing is now finished"

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來源

2012-10-12 Borealis

這是你所需要的？如果for循環中任何單獨的柵格發生任何錯誤，那麼它將打印出回溯，然後轉到下一個。

import traceback 

# Import arcpy module 
import arcpy 
from arcpy import env 
from arcpy.sa import * 
arcpy.CheckOutExtension("3D") 

# Set Over write 
arcpy.env.overwriteOutput = 1 

# Set the workspace 
env.workspace = r"Z:\temp.gdb" 
outworkspace = r"Z:\location2\temp2.gdb" 

# Local variables: 
counties = r"Z:\temp.gdb\boundaries\Counties" 
counties_lyr = arcpy.MakeFeatureLayer_management(counties,"counties_lyr") 

# Get the list of rasters to process 
raster_list = arcpy.ListRasters("*_clp") 
print raster_list 

for raster in raster_list: 
    try: 
     # Define name and location for output raster 
     name = outworkspace + "\\" + str(raster) 

     # Process: Raster Domain 
     arcpy.RasterDomain_3d(raster, "in_memory/temp", "POLYGON") 

     # Process: Central Feature 
     arcpy.MeanCenter_stats("in_memory/temp", "in_memory/temp1") 

     # Process: Select Layer By Location 
     arcpy.SelectLayerByLocation_management(counties_lyr, "intersect", "in_memory/temp1", "", "NEW_SELECTION") 

     # Clip Raster 
     arcpy.Clip_management(raster, "#", name,counties_lyr, "#", "ClippingGeometry") 

     # Delete in_memory 
     arcpy.Delete_management("in_memory") 

     print "processing " + raster + " complete..." 

    except: 
     print "Something went wrong handling " + str(raster) + ". Here's a traceback:" 
     traceback.print_exc() 
     continue 

print "All processing is now finished"

這是一個懶惰的程序員的實現，包裝的整個內容的for循環中嘗試...除了...塊，將捕獲的任何類型的任何地方塊例外。根據你的需求和口味，你可能會發現它更有用（或者更簡單）只捕獲你在練習中遇到的特定錯誤，就像dm03514所建議的那樣 - 但我認爲對於這樣的一個小腳本來說，它的輸出是即將被人看到，你所做的並不重要。

正如您在問題中指定的那樣，對您來說可能很重要的是您在發生錯誤時看到回溯。這就是traceback.print_exc（）進來的地方。:)

來源

2012-10-12 18:22:16

你可以在一個錯誤處理for循環。將代碼封裝在try塊中將允許您在參數無效的情況下處理錯誤。

try: 

# Process: Raster Domain 
    arcpy.RasterDomain_3d(raster, "in_memory/temp", "POLYGON") 

except ExcecuteError: 
    continue

這項工作將您的循環內其基本上是說，如果發生異常問題上continue這意味着去到下一個循環迭代。

你可以在任何地方放置try塊，因爲Mark Amery建議你可以在try中包裝整個for循環體。

來源

2012-10-12 18:20:22 dm03514

我不知道arcpy。但也許處理行969異常與：

try: 
    your stuff 

except arcpy.ExecuteError, error: 
    print error

可以幫助。

來源

2012-10-12 18:23:59 jazz

對於你對try/except/continue for for循環所說的話不太清楚。以下內容鬆散地基於您提供的代碼。

def failing_func(raster): 
    raise ValueError("raster <%s> function has failed" % (raster)) 

def working_func(raster): 
    print("raster <%s> function has succeeded" % (raster)) 
    return True 

raster_list = [0, 1, 2, 3, 4, 5] 

for raster in raster_list: 
    print("Processing <%s>" % (raster)) 

    try: 
     v1 = working_func("raster_1") 
     v2 = failing_func("raster_2") 
     v3 = working_func("raster_3") 
     v4 = failing_func("raster_4") 
     v5 = working_func("raster_5") 
    except ValueError, e: 
     print("Exception was raised: %s when processing item %s" % (str(e), raster)) 
     continue

，輸出：

Processing <0> 
raster <raster_1> function has succeeded 
Exception was raised: raster <raster_2> function has failed when processing item 0 
Processing <1> 
raster <raster_1> function has succeeded 
Exception was raised: raster <raster_2> function has failed when processing item 1 
Processing <2> 
raster <raster_1> function has succeeded 
Exception was raised: raster <raster_2> function has failed when processing item 2 
Processing <3> 
raster <raster_1> function has succeeded 
Exception was raised: raster <raster_2> function has failed when processing item 3 
Processing <4> 
raster <raster_1> function has succeeded 
Exception was raised: raster <raster_2> function has failed when processing item 4 
Processing <5> 
raster <raster_1> function has succeeded 
Exception was raised: raster <raster_2> function has failed when processing item 5

來源

2012-10-12 18:43:01 Smith

錯誤處理Python arcpy腳本需要的建議

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