如何用Python simplekml实现KML文件夹仅显示单选按钮

我需要从无人机记录的CSV点数据（每行含时间、经度、纬度、海拔）生成Google Earth可用的KML文件。现有代码通过simplekml库创建「点集合」和「飞行航线」两个文件夹，但设置simplekml.ListItemType.radiofolder后，文件夹内子项也出现单选按钮。我希望仅文件夹显示单选按钮，子项无此按钮，请问如何通过simplekml实现该效果？

附现有代码：

'''
the command line :
python test_kml.py
'''

import csv
import simplekml

kml = simplekml.Kml()

# read csv file
inputfile = csv.reader(open("csv_file.csv", 'r'))

# list where to store coords
points = []

# create folder for points
fol_points = kml.newfolder(name="The points")

# create points
for row in inputfile:
    coord = (float(row[1]), float(row[2]), float(row[3]))
    pnt = fol_points.newpoint(name=row[0], coords=[coord])
    points.append(coord)
    pnt.style.iconstyle.icon.href = 'http://maps.google.com/mapfiles/kml/shapes/placemark_circle.png'
    pnt.altitudemode = simplekml.AltitudeMode.relativetoground

# create folder for linestring
fol_line = kml.newfolder(name="The line")

#create line
ls = fol_line.newlinestring(name='the LineString')
ls.coords = points
ls.style.linestyle.width = 3
ls.altitudemode = simplekml.AltitudeMode.relativetoground
ls.extrude = 0

#try to put radiobutton on folder
fol_line.style.liststyle.listitemtype = simplekml.ListItemType.radiofolder
fol_points.style.liststyle.listitemtype = simplekml.ListItemType.radiofolder

#save kml file
kml.save("csv_file.kml")

问题根源是KML的样式会向下继承，当给父文件夹设置radiofolder后，其子元素会自动继承这个列表样式，导致子项也出现单选按钮。解决方法是给每个子元素（点和线串）单独设置列表项类型为默认的check，覆盖继承的样式。

修改后的代码如下：

'''
the command line :
python test_kml.py
'''

import csv
import simplekml

kml = simplekml.Kml()

# read csv file
inputfile = csv.reader(open("csv_file.csv", 'r'))

# list where to store coords
points = []

# create folder for points
fol_points = kml.newfolder(name="The points")

# create points
for row in inputfile:
    coord = (float(row[1]), float(row[2]), float(row[3]))
    pnt = fol_points.newpoint(name=row[0], coords=[coord])
    points.append(coord)
    pnt.style.iconstyle.icon.href = 'http://maps.google.com/mapfiles/kml/shapes/placemark_circle.png'
    pnt.altitudemode = simplekml.AltitudeMode.relativetoground
    # 给每个点设置默认列表项类型，覆盖父文件夹的单选样式
    pnt.style.liststyle.listitemtype = simplekml.ListItemType.check

# create folder for linestring
fol_line = kml.newfolder(name="The line")

#create line
ls = fol_line.newlinestring(name='the LineString')
ls.coords = points
ls.style.linestyle.width = 3
ls.altitudemode = simplekml.AltitudeMode.relativetoground
ls.extrude = 0
# 给线串设置默认列表项类型，覆盖父文件夹的单选样式
ls.style.liststyle.listitemtype = simplekml.ListItemType.check

# 设置文件夹为单选文件夹
fol_line.style.liststyle.listitemtype = simplekml.ListItemType.radiofolder
fol_points.style.liststyle.listitemtype = simplekml.ListItemType.radiofolder

#save kml file
kml.save("csv_file.kml")

关键修改说明 #

• 在创建每个点之后，添加pnt.style.liststyle.listitemtype = simplekml.ListItemType.check，将点的列表项类型设为默认的复选框样式，不再继承父文件夹的单选样式。
• 对线串做同样处理，添加ls.style.liststyle.listitemtype = simplekml.ListItemType.check，确保线串也使用默认的列表项样式。
• 父文件夹的radiofolder设置保留，这样两个文件夹会显示单选按钮，而内部的子元素则显示正常的复选框（无单选按钮）。

内容的提问来源于stack exchange，提问作者Toto1515