Detailed explanation of the use of yaml configuration file module in python

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Like GNU, YAML is a name for saying "no" recursively. The difference is that GNU says no to UNIX, and YAML says no to XML.
YAML is not XML.

Why not XML? Because:

1. YAML has good readability.

2. YAML has good interactivity with scripting languages.

3. YAML uses data types that implement the language.

4. YAML has a consistent information model.

5. YAML is easy to implement.

The above 5 items are the shortcomings of XML. At the same time, YAML also has the following advantages of XML:

YAML can be processed based on streams;

YAML has strong expressive capabilities and good scalability.

In short, YAML attempts to use a more agile way than XML to complete the tasks completed by XML.

Syntax

Structures are shown through space indentation. Items in the list are represented by "-", and key-value pairs in the dictionary are separated by ":".

This is almost all the syntax.

For example ……

Generally, the YAML file extension is .yaml. For example: yaml_example.yaml

Write yaml into the configuration script test.yaml. The following describes how to read and write yaml configuration.

Get started

1. First install the yaml module

pip3 install pyyaml

2. Write the yaml configuration file yaml_example.yaml

name: junxi
age: 18
spouse:
 name: Rui
 age: 18
children:
 - name: Chen You
  age: 3
 - name: Ruo Xi
  age: 2

3. Write the python program yaml_example.py that parses the yaml file

#!/usr/bin/env python
# _*_ coding:utf-8 _*_
__author__ = 'junxi'

import sys

# sys.path.insert(0, 'D:/program/python-腾讯课程/0-01-python其他模块学习/')

import yaml

f = open('yaml_example.yaml')
content = yaml.load(f)

print type(content)
print '修改前: ', content # 可以看出整个Yaml配置文件是一个字典, 里面可以包含字典和列表
content['age'] = 17  # 根据Key修改对应的值
content['children'][1]['age'] = 1
print '修改后: ', content

The result output by the program is:

Before modification : {'age': 18, 'spouse': {'age': 18, 'name': 'Rui'}, 'name': 'junxi', 'children': [{'age': 3, 'name ': 'Chen You'}, {'age': 2, 'name': 'Ruo Xi'}]}
After modification: {'age': 17, 'spouse': {'age': 18, 'name': 'Rui'}, 'name': 'junxi', 'children': [{'age': 3, 'name': 'Chen You'}, {'age': 1, 'name': 'Ruo Xi'}]}

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