Question

我有下面的列表，我必须从中检索port号，我想要的值是50051，但得到的是port=50051，我知道我可以通过迭代列表来检索并使用字符串操作，但希望查看是否有直接方法可以访问它。

r = requests.get(url_service)

data = {}
data = r.json()

#Below is the json after printing
[{'ServerTag': [  'abc-service=true',
                  'port=50051',
                  'protocol=http']
}]

print(data[0]["ServiceTags"][1]) // prints port=50051

Answer 1

您也许可以执行以下操作：

received_dic = {
    'ServerTag': [  'abc-service=true',
                  'port=50051',
                  'protocol=http']
}

ServerTag = received_dic.get("ServerTag", None)
if ServerTag:
    port = list(filter(lambda x: "port" in x, ServerTag))[0].split("=")[1]
    print(port)   
# 50051

Answer 2

考虑到您拥有以下JSON：

[
    {
         "ServerTag": ["abc-service=true", "port=50051", "protocol=http"]
    }
]

您可以像这样提取您的值：

from functools import partial

# ...

def extract_value_from_tag(tags, name, default=None):
    tags = map(partial(str.split, sep='='), tags)
    try:
        return next(value for key, value in tags if key == name)
    except StopIteration:
        # Tag was not found
        return default

然后您就可以：

# Providing data is the deserialized JSON as a Python list
# Also assuming that data is not empty and ServerTag is present on the first object
tags = data[0].get('ServerTag', [])
port_number = extract_value_from_tag(tags, 'port', default='8080')

从此json列表中检索端口值的最有效方法是什么

2 个答案: