[英]How can I get list of values of keys in list of dicts in python?
我有一個字典列表:
[{"app1": "value1"},{"app2": "value2"},{"app1": "value3"},{"app1": "value4"}, {"app3": "value5"}]
如何獲取列表中某個鍵的所有值? 因此,例如對於“app1”,它應該變成這樣:
{"app1":["value1", "value3", "value4"]}
對於“app2”,它就變成了:
{"app2":["value2"]}
使用帶有嵌套for
循環的defaultdict
from collections import defaultdict
d = defaultdict(list)
lst = [{"app1": "value1"},{"app2": "value2"},{"app1": "value3"},{"app1": "value4"}, {"app3": "value5"}]
for i in lst:
for k,v in i.items():
d[k].append(v)
print(dict(d))
{'app1': ['value1', 'value3', 'value4'], 'app2': ['value2'], 'app3': ['value5']}
a = [{"app1": "value1"},{"app2": "value2"},{"app1": "value3"},{"app1": "value4"}, {"app3": "value5"}] #list of dicts
k = "app1" #key to look for
out = {k: []}
for item in a:
for key in list(item):
if key == k:
out[k].append(item[key])
print(out)
{'app1': ['value1', 'value3', 'value4']}
您可以使用列表推導來獲取給定鍵的所有值:
>>> data = [{"app1": "value1"},{"app2": "value2"},{"app1": "value3"},{"app1": "value4"}, {"app3": "value5"}]
>>> {"app1": [d["app1"] for d in data if "app1" in d]}
{'app1': ['value1', 'value3', 'value4']}
如果你想把它全部累積到一個 dict 中,只需將列表理解放入一個 dict 理解中:
>>> {k: [d[k] for d in data if k in d] for d in data for k in d}
{'app1': ['value1', 'value3', 'value4'], 'app2': ['value2'], 'app3': ['value5']}
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.