如何将值作为一个集合来创建字典?

Question

我正在尝试创建一个字典，但我希望它的值部分是一个集合。我想把这些值放到一个集合中每次我循环的时候，例如，{key: value} ->{key: value, value, value}， {key: value, value}下面是我的代码

from bs4 import BeautifulSoup
import urllib
import re
def linkTexts(url):
url = urllib.request.urlopen(url).read()
soup = BeautifulSoup(url,'lxml')

q2Dictionary = {}
links = soup.find_all('a', href = True)
for link in links:
linkUrl = link["href"]
if 'http' in linkUrl:
linkText = link.get_text().strip()
if linkUrl not in q2Dictionary.keys():
q2Dictionary[linkUrl] = linkText
if linkUrl in q2Dictionary.keys():
q2Dictionary.update({linkUrl: linkText})

Answer 1

使用空集dict.setdefault():

q2Dictionary.setdefault(linkUrl, set()).add(linkText)

这相当于:

if linkUrl not in q2Dictionary:
q2Dictionary[linkUrl] = set()
q2Dictionary[linkUrl].add(linkText)

Answer 2

而不是创建字符串字典。为什么不创建一个字符串列表的字典呢?

from bs4 import BeautifulSoup
import urllib
import re
def linkTexts(url):
url = urllib.request.urlopen(url).read()
soup = BeautifulSoup(url,'lxml')

q2Dictionary = {}
links = soup.find_all('a', href = True)
for link in links:
linkUrl = link["href"]
if 'http' in linkUrl:
linkText = link.get_text().strip()
if linkUrl not in q2Dictionary.keys():
q2Dictionary[linkUrl] = [linkText]
else:
q2Dictionary[linkUrl].append(linkText)

使用linkText初始化每个键，并将具有相同键的linkText附加到现有列表中。