使用ruamel.yaml添加字典条目时，如何避免自动生成id001锚点别名？

问题出在ruamel.yaml默认会为序列（列表）类型的锚点重新生成自动命名的别名（如id001），要保留原锚点名称，只需在加载后手动指定锚点的名称即可：

修改后的代码 #

import ruamel.yaml
yaml = ruamel.yaml.YAML()
yaml.preserve_quotes = True
yaml.indent(mapping=2, sequence=4, offset=2)

raw = """---
# Some config file..
# This is the main clients config
clients:
  foobar1:
    name: foo Bar 1
    auth: false
    count: 1290
  barboz:
    name: BarraBoz
    auth: true
    count: 19
uids_default: &uids_default
  - attribute_email: mail
    datafile: vars1
uids:
  - <<: *uids_default
    skip: true
  - <<: *uids_default
    issuer: http://foo.bar
"""

vanhelst = {"adfs": 124423423, "123": "adsfadsfasdf", "name": "Dirk Van helst"}

data = yaml.load(raw)
# 手动指定原有锚点的名称，防止自动生成别名
data['uids_default'].anchor.name = 'uids_default'
data["clients"].insert(len(data["clients"]), "vanhelst", vanhelst)

# Write to file
with open("/tmp/out.yml", "w") as f:
    yaml.dump(data, f)

输出的YAML文件 #

# Some config file..
# This is the main clients config
clients:
  foobar1:
    name: foo Bar 1
    auth: false
    count: 1290
  barboz:
    name: BarraBoz
    auth: true
    count: 19
  vanhelst:
    adfs: 124423423
    '123': adsfadsfasdf
    name: Dirk Van helst
uids_default: &uids_default
  - attribute_email: mail
    datafile: vars1
uids:
  - <<: *uids_default
    skip: true
  - <<: *uids_default
    issuer: http://foo.bar

原理说明 #

ruamel.yaml加载YAML时，会将带锚点的序列对象转为CommentedSeq类型，但其锚点名称在序列化时可能被自动重置。通过手动设置anchor.name为原锚点名称，就能强制dump时使用原有锚点标识，避免生成自动命名的别名。

内容的提问来源于stack exchange，提问作者Dick Visser