Please help to write the meaningful code for the task: I need to count for all tags "way" in XML OpenStreet Map file, the quantity of "nd" tag in each, and input the id of the tag 'way', which include the biggest quantity of tags "nd". If there are several ide's then input the first one in alphabetical order. Seems easy, but I cannot understand how to operate. (I only think it will be useful to use vocabulary) This is the code:
from urllib.request import urlopen, urlretrieve
from bs4 import BeautifulSoup
resp = urlopen('https://stepik.org/media/attachments/lesson/245681/map2.osm') #
xml = resp.read().decode('utf8') #
soup = BeautifulSoup(xml, 'xml') # делаем суп с помощью lxml
cnt = 0
names ={}
for way in soup.find_all('way'): # go through the nodes
flag=False
for nd in way('nd'):
flag=True
if nd['k'] == 'id':
name=nd['v']
if flag:
if name not in names:
names[name]=0
names[name]+=1
print(sort(names))
You can use max() builtin method to find <way> tag with biggest quantity of <nd>.
For example:
import requests
from bs4 import BeautifulSoup
url = 'https://stepik.org/media/attachments/lesson/245681/map2.osm'
soup = BeautifulSoup(requests.get(url).content, 'html.parser')
num_way = len(soup.select('way'))
w = max(sorted(soup.select('way:has(nd)'), reverse=True, key=lambda tag: int(tag['id'])), key=lambda tag: len(tag.select('nd')))
print('number of <way>:', num_way)
print('id:', w['id'])
print('quantity of <nd>:', len(w.select('nd')))
Prints:
number of <way>: 3181
id: 227140108
quantity of <nd>: 249
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