一，注意
这里首先要更正一下网上大部分博客的说法：使用PyYAML写入时不是yaml的标准形式。例如使用PyYAML将字典嵌套字典的数据写入yaml文件时，写入的yaml文件里会出现带{}的数据。实际我在写代码的过程中发现PyYAML5.3.1版本并不会出现这种情况。如下所示：
使用PyYAML库写入yaml文件
# @author: 给你一页白纸 import yaml data = { "str": "Hello world.", "int": 110, "list": [10, "she", ["he", "it"]], "dict": {"account":"xiaoqq", "password": {"pwd1": 123456, "pwd2": "water"}}, "tuple": (100, "a") } with open('./writeYamlData.yml', 'w', encoding='utf-8') as f: yaml.dump(data=data, stream=f, allow_unicode=True)
写入后的yaml文件内容如下：
dict: account: xiaoqq password: pwd1: 123456 pwd2: water int: 110 list: - 10 - she - - he - it str: Hello world. tuple: !!python/tuple - 100 - a
二，安装ruamel.yaml库
安装命令：
pip install ruamel.yaml # 安装速度慢则加上镜像源 pip install ruamel.yaml -i https://pypi.tuna.tsinghua.edu.cn/simple
使用时导入：
from ruamel import yaml
三，ruamel.yaml写入yaml文件
使用yaml.dump()方法写入，代码展示如下：
# @author: 给你一页白纸 from ruamel import yaml data = { "str": "Hello world.", "int": 110, "list": [10, "she", ["he", "it"]], "dict": {"account":"xiaoqq", "password": {"pwd1": 123456, "pwd2": "water"}}, "tuple": (100, "a") } # path为yaml文件的绝对路径 path ='./writeYamlData.yml' with open(path, 'w', encoding='utf-8') as f: yaml.dump(data, f, Dumper=yaml.RoundTripDumper)
写入结果如下：
str: Hello world. int: 110 list: - 10 - she - - he - it dict: account: xiaoqq password: pwd1: 123456 pwd2: water tuple: - 100 - a
注意：这里yaml.dump()里加上l了参数Dumper=yaml.RoundTripDumper。不加该参数则写入结果如下：
dict: account: xiaoqq password: {pwd1: 123456, pwd2: water} int: 110 list: - 10 - she - [he, it] str: Hello world. tuple: !!python/tuple [100, a]
四，ruamel.yaml读取yaml文件
yaml文件数据如下：
dict: account: xiaoqq password: pwd1: 123456 pwd2: water int: 110 list: - 10 - she - - he - it str: Hello world. tuple: !!python/tuple - 100 - a
使用yaml.load()方法读取，代码展示如下：
# @author: 给你一页白纸 from ruamel import yaml # path为yaml文件的绝对路径 path ='./writeYamlData.y' with open(path, 'r', encoding='utf-8') as doc: content = yaml.load(doc, Loader=yaml.Loader) print(content)
读取结果如下：
C:\Users\xiaoqq\AppData\Local\Programs\Python\Python37\python.exe C:/Users/xiaoqq/Desktop/test_project/readYaml.py {'dict': {'account': 'xiaoqq', 'password': {'pwd1': 123456, 'pwd2': 'water'}}, 'int': 110, 'list': [10, 'she', ['he', 'it']], 'str': 'Hello world.', 'tuple': (100, 'a')} Process finished with exit code 0
ruamel.yaml库继承子PyMYAL库，读写方法基本相同，目前来说可以根据自己的习惯选择使用 ruamel.yaml 还是 PyMYAL 进行yaml文件的读写操作。
