Question

我有一个如下代码，我希望从torn_all层中选择日期等于year_month，例如2009-12将被选中之后。所以我应该加上2009-12％。但是年月都在变化。

import arcpy
from arcpy import env

years=['2010','2011','2012','2013']
months=["01","02","03","04","05","06","07","08","09","10","11","12"]



env.workspace="c:/twu/wind/torn/tonardo.gdb"
arcpy.MakeFeatureLayer_management("torn_all", "lyr")

for year in years:
    for month in months:
        arcpy.SelectLayerByAttribute_management("lyr","NEW_SELECTION",' "date" LIKE "%s-%s%"') %(year,month)
        arcpy.CopyFeatures_management("lyr", "c:/twu/wind/torn/tonardo.gdb/torn_%s/torn_%s_%s") %(year,year,month)
        arcpy.SelectLayerByAttribute_management("lyr","CLEAR_SELECTION")

错误是 Traceback（最近一次调用最后一次）：文件“C：/twu/wind/code/sep_month_tor.py”，第16行，in arcpy.SelectLayerByAttribute_management（“lyr”，“NEW_SELECTION”，“”date“LIKE”％s-％s％“'）％（年，月）在SelectLayerByAttribute中输入文件“C：\ Program Files（x86）\ ArcGIS \ Desktop10.2 \ arcpy \ arcpy \ management.py”，第6688行提高e ExecuteError：ERROR 000358：表达式无效无法执行（SelectLayerByAttribute）。

Answer 1

string formatting的方法变得混乱：您尝试同时包含百分号%并调用插值运算符%s。它认为%正在寻找第三个论点。

请改为string.format()

'"date" LIKE "{0}-{1}%"'.format(year,month)
'c:/twu/wind/torn/tonardo.gdb/torn_{0}/torn_{0}_{1}'.format(year,month)

在循环中按属性选择，年份和月份更改arcpy

1 个答案: