SIngle字符y和Y作为YAML 1.1布尔值转储 [英] SIngle character y and Y get dumped as YAML 1.1 booleans

问题描述

当我这样做时:

from ruamel import yaml

seq = ["x", "y", "z", "Y", "true", True]
print(yaml.dump(seq, version=(1,1)))

它给出:

%YAML 1.1
--- [x, y, z, Y, 'true', true]

，但我希望引用y和Y，因为它们是布尔值，因为这是YAML 1.1，因此被重新加载为布尔值. 而且此 错误，表明此问题是 解决.

but I expected the y and Y to be quoted, because these get loaded back as booleans because this is YAML 1.1. Moreover this bug, indicates this problem is solved.

为什么即使在ruamel.yaml> = 0.15.93版本上仍显示此错误，此错误仍标记为已关闭?

Why is this bug marked as closed, when it still shows this error even on version ruamel.yaml>=0.15.93?

推荐答案

您正在使用不安全的PyYAML兼容性函数dump()(此外，这样做的效率很低).该功能已过时，但模仿了PyYAML的错误行为.

You are using the unsafe PyYAML compatibility function dump() (and besides you do so in an inefficient way). That function is outdated but emulates PyYAML's erroneous behaviour.

您 应该改为 实例化YAML()实例并使用其.dump()方法.

You should instead instantiating a YAML() instance and using its .dump() method.

import sys
import yaml as pyyaml
import ruamel.yaml

seq = ["x", "y", "z", "Y", "true", True]
print("PyYAML version:", pyyaml.__version__)
pyyaml.dump(seq, sys.stdout, default_flow_style=None, explicit_start=True, version=(1,1))
print()

yaml = ruamel.yaml.YAML(typ='safe')
yaml.version = (1,1)
yaml.default_flow_style=None
print("ruamel.yaml version:", ruamel.yaml.__version__)
yaml.dump(seq, sys.stdout)

给出:

PyYAML version: 5.3.1
%YAML 1.1
--- [x, y, z, Y, 'true', true]

ruamel.yaml version: 0.16.10
%YAML 1.1
--- [x, 'y', z, 'Y', 'true', true]

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