JsonPath如何使用

$ ：根节点

@：现行节点

. 或者[ ] ：取子节点

..：不管位置，选择节点

*：匹配所有节点

[ ]：内部可以填上索引值、键名，

In[1]: from jsonpath import jsonpath  #导入

In[2]: bro_infos = {
  ...:     "browsers":{
  ...:         "chrome":["chrome1","chrome2","chrome3","chrome4"],
  ...:         "opera":["opera1","opera2","opera3","opera4"],
  ...:         "firefox":["firefox1","firefox2","firefox3","firefox4",],
  ...:     }

In[3]: jsonpath(bro_infos,‘$..chrome‘) #选择所有chrome节点的值
Out[3]: [[‘chrome1‘, ‘chrome2‘, ‘chrome3‘, ‘chrome4‘]]

In[4]: jsonpath(bro_infos,‘$..chrome[0,2]‘)  #选择chrome节点第1和第3个元素
Out[4]: [‘chrome1‘, ‘chrome3‘]

In[5]: jsonpath(bro_infos,‘$.browsers.*[2]‘) #选择browsers所有子节点的第3个元素
Out[5]: [‘chrome3‘, ‘opera3‘, ‘firefox3‘]

In[6]: jsonpath(bro_infos,‘$..[chrome,firefox]‘) #选择chrome节点和firefox节点
Out[6]: 
[[‘chrome1‘, ‘chrome2‘, ‘chrome3‘, ‘chrome4‘],
 [‘firefox1‘, ‘firefox2‘, ‘firefox3‘, ‘firefox4‘]]

In[7]: jsonpath(bro_infos,‘$..[browsers,firefox]‘) #[ ]中选择的内容可以跨层级
Out[7]: 
[{‘chrome‘: [‘chrome1‘, ‘chrome2‘, ‘chrome3‘, ‘chrome4‘],
  ‘opera‘: [‘opera1‘, ‘opera2‘, ‘opera3‘, ‘opera4‘],
  ‘firefox‘: [‘firefox1‘, ‘firefox2‘, ‘firefox3‘, ‘firefox4‘]},
 [‘firefox1‘, ‘firefox2‘, ‘firefox3‘, ‘firefox4‘]]

In[8]: jsonpath(bro_infos,‘$.browsers.*‘) #选择browsers下面所有子节点的值
Out[8]: 
[[‘chrome1‘, ‘chrome2‘, ‘chrome3‘, ‘chrome4‘],
 [‘opera1‘, ‘opera2‘, ‘opera3‘, ‘opera4‘],
 [‘firefox1‘, ‘firefox2‘, ‘firefox3‘, ‘firefox4‘]]