Question

我这样做是为了阅读文件

f = subprocess.Popen(["../../../abc/def/run_script.sh", "cat", "def/data/ex/details.json"], stdout=subprocess.PIPE)
out = f.stdout.readline()

从上面读取的文件内容如下所示：

{
         "def1": {
         "val1": 31.6, "val2" : 10
         },
         "def2": {
         "9": {
          "val1": 20.1, "val2": 22
         }
         }
         }

我应该怎么做呢。当只有1“val1”和1“val2”时，我用正则表达式进行了简单搜索并保存了值。既然有两个，我需要小心知道我正在处理哪一个..是否有一个简单的出路..？

 File "/usr/lib/python2.7/json/__init__.py", line 338, in loads
                                                                                                                                                               return _default_decoder.decode(s)
                                                                                                                                                                                                  File "/usr/lib/python2.7/json/decoder.py", line 366, in decode
                                                         obj, end = self.raw_decode(s, idx=_w(s, 0).end())
                                                                                                            File "/usr/lib/python2.7/json/decoder.py", line 382, in raw_decode
                                                                                                                                                                                  obj, end = self.scan_once(s, idx)
ValueError: Expecting object: line 1 column 3 (char 2)

Answer 1

使用the json module解析JSON。

Python 3代码：

import json
import subprocess

with subprocess.Popen(["cat", "/tmp/foo.json"], stdout=subprocess.PIPE) as f:
    j = f.stdout.read()
o = json.loads(j.decode("UTF-8"))
print(o)
print(o["def1"]["val1"])
print(o["def2"]["9"]["val1"])

<强>输出：

{'def1': {'val1': 31.6, 'val2': 10}, 'def2': {'9': {'val1': 20.1, 'val2': 22}}}
31.6
20.1

修改

对于Python 2，请改用它。

import json import subprocess f = subprocess.Popen(["cat", "/tmp/foo.json"], stdout=subprocess.PIPE) j = f.stdout.read() o = json.loads(j.decode("UTF-8")) print o print o["def1"]["val1"] print o["def2"]["9"]["val1"]

区分文件读取中的2行

1 个答案: