Question

有没有理由我的计数等于零，当它应该是29.我试图初始化我的函数内的计数但是它说它没有定义。

shapefile = "Schools.shp"
work = r"c:\Scripts\Lab 6 Data"
facility = "HIGH SCHOOL"
count = 0

def numSchools(work, shapefile, facility):

    whereClause = "\"FACILITY\" = 'HIGH SCHOOL' " # where clause for high schools
    cursor = arcpy.SearchCursor("Schools.shp", facility)
    result = arcpy.GetCount_management(cursor)
    for result in cursor:
        count = int(result.getOutput(0))# Get the first value from the Result object
    return count

print ("The number of " + facility + " are:"), int(count)

在最基本的形式中，此代码返回正确数量的学校。

import arcpy

arcpy.env.workspace = r"c:\Scripts\Lab 6 Data"
result = arcpy.GetCount_management("Schools.shp")
count = int(result.getOutput(0)) 
print ("The number of rows in 'schools' is "),int(count)

但是，Schools.shp是一个包含201所学校的文件。

我需要在该档案中进入一个名为“设施”的字段，然后在其中获取“高中”的数量＆＃39; （我知道如何做这部分）。但我也需要这个代码作为一个函数（这是我遇到的麻烦）。

Answer 1

虽然你的问题没有解决，但我认为你正在寻找这个！

print ("The number of " + facility + " are:", int(count) )

Answer 2

            searchCurs = arcpy.da.SearchCursor(shapefile, field, whereClause)
            row = searchCurs.next()
            for row in searchCurs:
                            value = row[0]
                            high_schools = [row[0] for row in arcpy.da.SearchCursor(shapefile, field, whereClause)]
                            count = len(high_schools)
                            print count

使用方法进行变量初始化（Python）

2 个答案: