英文:
Convert list data into dictionary
问题
这个错误是因为在以下这行代码中，dd["id"] 返回了 None：
(d["id"], d["regionId"]): {dd["id"]: dd for dd in d["groups"]} for d in json_data
造成这个问题的原因可能是 JSON 数据中某些子项缺少 "id" 键。为了解决这个问题，你可以在访问 dd["id"] 之前添加一些检查，以确保键存在。例如，你可以使用 get 方法来访问键，如果键不存在，则返回一个默认值，如下所示：
(d["id"], d["regionId"]): {dd.get("id", "Unknown"): dd for dd in d["groups"]} for d in json_data
这将返回 "Unknown" 如果 "id" 键不存在。这样，即使 JSON 数据中某些子项缺少 "id" 键，你的代码也不会引发 TypeError 错误。
英文:
I have extracted the content of a script from a website. Now I want to transform the received data list to a dictionary to have an easier search.
The json data (json_data) looks like that (part of):
'id': 'dungeons-and-raids',
'name': 'Dungeons & Raids',
'regionId': 'US',
'groups': [{
'content': {
'lines': [{
'icon': 'ability_toughness',
'name': 'Fortified',
'url': '/affix=10/fortified'
}, {
'icon': 'spell_nature_cyclone',
'name': 'Storming',
'url': '/affix=124/storming'
}, {
'icon': 'ability_ironmaidens_whirlofblood',
'name': 'Bursting',
'url': '/affix=11/bursting'
}],
'icons': 'large'
},
'id': 'mythicaffix',
'name': 'Mythic+ Affixes',
},
...
And this is my complete Python 3.11 script:
import re
import json
from urllib.request import Request, urlopen
req = Request(
"https://www.wowhead.com/today-in-wow", headers={"User-Agent": "Mozilla/5.0"}
)
html_page = urlopen(req).read().decode("utf-8")
json_data = re.search(
r"TodayInWow\(WH\.ge\('tiw-standalone'\), (.*), true\);", html_page
)
json_data = json.loads(json_data.group(1))
data = {
(d["id"], d["regionId"]): {dd["id"]: dd for dd in d["groups"]} for d in json_data
}
for affixline, affixp in enumerate(data[("dungeons-and-raids",
"US")]["mythicaffix"]['content']['lines']):
affixurl = affixp['url']
affixname = affixp['name']
affixid = affixline
This gives me the error:
TypeError: 'NoneType' object is not subscriptable
It seems dd["id"] returns "None", but I don't know why. What is the correct way to use the dictionary in this case?
答案1
得分: 3
Add a check if the returned group from the server is not null:
import re
import json
from urllib.request import Request, urlopen
req = Request(
"https://www.wowhead.com/today-in-wow", headers={"User-Agent": "Mozilla/5.0"}
)
html_page = urlopen(req).read().decode("utf-8")
json_data = re.search(
r"TodayInWow\(WH\.ge\('tiw-standalone'\), (.*), true\);", html_page
)
json_data = json.loads(json_data.group(1))
data = {
(d["id"], d["regionId"]): {dd["id"]: dd for dd in d["groups"] if dd} for d in json_data # <-- add check if group is not null
}
for affixline, affixp in enumerate(data[("dungeons-and-raids", "US")]["mythicaffix"]['content']['lines']):
affixurl = affixp['url']
affixname = affixp['name']
print(affixurl, affixname)
Prints:
/affix=10/fortified Fortified
/affix=124/storming Storming
/affix=11/bursting Bursting
英文:
Add a check if the returned group from the server is not null:
import re
import json
from urllib.request import Request, urlopen
req = Request(
"https://www.wowhead.com/today-in-wow", headers={"User-Agent": "Mozilla/5.0"}
)
html_page = urlopen(req).read().decode("utf-8")
json_data = re.search(
r"TodayInWow\(WH\.ge\('tiw-standalone'\), (.*), true\);", html_page
)
json_data = json.loads(json_data.group(1))
data = {
(d["id"], d["regionId"]): {dd["id"]: dd for dd in d["groups"] if dd} for d in json_data # <-- add check if group is not null
}
for affixline, affixp in enumerate(data[("dungeons-and-raids", "US")]["mythicaffix"]['content']['lines']):
affixurl = affixp['url']
affixname = affixp['name']
print(affixurl, affixname)
Prints:
/affix=10/fortified Fortified
/affix=124/storming Storming
/affix=11/bursting Bursting
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