唯一项序列 (UniqueSeq)

UniqueSeq 验证不包含重复值的序列。

示例 yaml_snippet

- A
- B
- C

from strictyaml import UniqueSeq, Str, load, as_document
from ensure import Ensure

schema = UniqueSeq(Str())

有效

Ensure(load(yaml_snippet, schema)).equals(["A", "B", "C", ])

使用一个重复解析会引发异常

- A
- B
- B

load(yaml_snippet, schema)

strictyaml.exceptions.YAMLValidationError:
while parsing a sequence
  in "<unicode string>", line 1, column 1:
    - A
     ^ (line: 1)
duplicate found
  in "<unicode string>", line 3, column 1:
    - B
    ^ (line: 3)

解析所有重复会引发异常

- 3
- 3
- 3

load(yaml_snippet, schema)

strictyaml.exceptions.YAMLValidationError:
while parsing a sequence
  in "<unicode string>", line 1, column 1:
    - '3'
     ^ (line: 1)
duplicate found
  in "<unicode string>", line 3, column 1:
    - '3'
    ^ (line: 3)

使用重复序列化会引发异常

as_document(["A", "B", "B"], schema)

strictyaml.exceptions.YAMLSerializationError:
Expecting all unique items, but duplicates were found in '['A', 'B', 'B']'.

可执行规范

从 unique-sequence.story storytests 自动生成的文档。