Python json format processing

First, put a piece of code

import requests
import jsonpath
import json
f=open('ip.txt','r',encoding='utf-8')
for my_ip in f.readlines():
    my_ip=str(my_ip[:-1])
    respons=requests.get('http://ip-api.com/json/{ip}?lang=zh-CN'.format(ip=my_ip)).json()
    countr=jsonpath.jsonpath(respons,"$..country")
    sheng=jsonpath.jsonpath(respons,"$..regionName")
    cit=jsonpath.jsonpath(respons,"$..city")
    ipip=jsonpath.jsonpath(respons,"$..query")
    print(respons)
    print(countr+sheng+cit+ipip)

Json defined

JSON: JavaScript Object Notation(JavaScript 对象表示法)
JSON 是存储和交换文本信息的语法。类似 XML。
JSON 比 XML 更小、更快，更易解析。

1.json moudle use

Python and JSON data type relation table:

Python	JSON	Explanation
dict	object	dictionary
list, tuple	array	sequence
str	string	String
int, float	number	Digital Type
True	true	Boolean value True
False	false	Boolean value False
None	null	Null

Now that you know why you want to convert it to understand how the conversion, which need to use Python's built-in module json, built-in module, can be directly referenced in the code:

import json

json module used on the four main functions:

json.dumps (): the Python data by encoding (converting) data into JSON; json.loads (): the data conversion JSON (decodes) data for Python; The json.dump (): the encoded data and write Python JSON file; json.load (): read data from the file and decoding JSON.

The use 2.jsonpath

JsonPath contrast with XPath syntax:

Json clear structure, high readability, low complexity, very easy to match the corresponding table usage XPath.

Xpath	JSONPath	description
/	$	With node
.	@	The current node
/	. or []	Take the child nodes
..	n/a	That is, regardless of location, select all the qualifying conditions
*	*	Matches all element nodes
[]	[]	Flag iterator (simple iteration operation can be done on the inside, such as the array index, according to the content selected value, etc.)
&#124	[,]	Support iterator do multiple choice
[]	?()	Support filtering
n/a	()	Support for expression evaluation
()	n/a	Grouping, JsonPath not supported

Precautions:

json.loads () is converted into a decoded format string Json Python object, if at the time json.loads error codes are decoded to be noted Json characters.

String transcoding

任何平台的任何编码，都能和Unicode互相转换。

UTF-8 and GBK mutual conversion, it is first converted to Unicode UTF-8, and then converting from Unicode to GBK, empathy and vice versa.

# 这是一个 UTF-8 编码的字符串
utf8Str = "你好地球"

# 1. 将 UTF-8 编码的字符串 转换成 Unicode 编码
unicodeStr = utf8Str.decode("UTF-8")

# 2. 再将 Unicode 编码格式字符串 转换成 GBK 编码
gbkData = unicodeStr.encode("GBK")

# 1. 再将 GBK 编码格式字符串 转化成 Unicode
unicodeStr = gbkData.decode("gbk")

# 2. 再将 Unicode 编码格式字符串转换成 UTF-8
utf8Str = unicodeStr.encode("UTF-8")