如何使用关键字在 json 文件中搜索特定行？

Question

我想知道如何搜索具有特定名称的行。这是我的 .txt 文件 json:

{"people": [{"name": "Scott", "website": "stackabuse.com", "from": "Nebraska"}, {"name": "Larry", "website": "google.com", "from": "Michigan"}, {"name": "Tim", "website": "apple.com", "from": "Alabama"}]}

这是我的代码

import json

file = open('data.txt', "r")
read = file.read()
y = json.loads(read)

first = y["people"][0]
second = y["people"][1]
third = y["people"][2]

print(y["people"][0]["name"])

打印出 Scott，但是有没有办法在 json 文件中搜索名为 Scott 的行？我试过 print(y["people"]["name": "Scott"]) 但这没有用。我希望输出为 {"name": "Scott", "website": "stackabuse.com", "from": "Nebraska"}

Answer 1

我建议使用 jmespath (https://pypi.org/project/jmespath/)

Answer 2

您可以使用 list comprehension 来过滤列表。例如

>>> people = y['people']
>>> people_named_scott = [p for p in people if p['name'] == 'Scott']
>>> people_named_scott
[{'name': 'Scott', 'website': 'stackabuse.com', 'from': 'Nebraska'}]

Answer 3

如果我没理解错的话，您正在尝试打印名为 Scott 的 json 的列表。

print([jobj if jobj['name']=='Scott' for jobj in y['people']])

Answer 4

您可以执行类似这样的操作，它会遍历所有人，然后 returns 具有匹配名称的第一个人。

def getPersonByName(allInfo, name):
    for info in allInfo["people"]:
        if info["name"] == name:
            return info

allInfo = {"people": [{"name": "Scott", "website": "stackabuse.com", "from": "Nebraska"}, {"name": "Larry", "website": "google.com", "from": "Michigan"}, {"name": "Tim", "website": "apple.com", "from": "Alabama"}]}

print(getPersonByName(allInfo, "Scott"))

Answer 5

您可以将姓名为Scott的人的信息存储在列表中。

Python代码：

import json

file = open('data.txt', "r")
read = file.read()
y = json.loads(read)
people = y["people"]
lines = [person for person in people if person["name"] == "Scott"]
if len(lines) == 0:
    print("Scott is not found")
else:
    for line in lines:
        print(line)

data.txt:

{"people": [{"name": "Scott", "website": "stackabuse.com", "from": "Nebraska"}, {"name": "Larry", "website": "google.com", "from": "Michigan"}, {"name": "Tim", "website": "apple.com", "from": "Alabama"}]}

输出：

{'name': 'Scott', 'website': 'stackabuse.com', 'from': 'Nebraska'}

Answer 6

您可以使用内置的 filter function combined with a lambda 表达式来求解。

data={"people": [{"name": "Scott", "website": "stackabuse.com", "from": "Nebraska"}, {"name": "Larry", "website": "google.com", "from": "Michigan"}, {"name": "Tim", "website": "apple.com", "from": "Alabama"}]}
print(filter(lambda x:x['name'] == 'Scott',data['people']))
# gives [{'website': 'stackabuse.com', 'from': 'Nebraska', 'name': 'Scott'}]

如何使用关键字在 json 文件中搜索特定行？

How do I search for a certain line in a json file with a key word?

python

search

json

keyword