我有这种数据类型只是对相关数据进行分组。它应该是一个类似结构的东西,所以我选择了namedtuple
。
ConfigOption = namedtuple('ConfigOption', 'one two animal vehicle fairytale')
另一方面,namedtuple
没有默认值,所以我居住在another answer提出的黑客攻击。
ConfigOption.__new__.__defaults__ = (1, 2, "White Horse", "Pumpkin", "Cinderella")
显然,这使得类型检查失败:error: "Callable[[Type[NT], Any, Any, Any, Any, Any], NT]" has no attribute "__defaults__"
由于我很清楚这是一个黑客,我告诉类型检查器所以使用内联注释# type: disable
:
ConfigOption.__new__.__defaults__ = (1, 2, "White Horse", "Pumpkin", "Cinderella") # type: disable
此时......线路变得太长。我不知道如何打破这一行,以便它在语法上是正确的,同时使类型检查器跳过它:
# the ignore is on the wrong line
ConfigOption.__new__.__defaults__ = \
(1, 2, "White Horse", "Pumpkin", "Cinderella") # type: ignore
# unexpected indentation
ConfigOption.__new__.__defaults__ = # type: ignore
(1, 2, "White Horse", "Pumpkin", "Cinderella")
那么有没有办法从类型检查中排除单行,或者格式化这条长行,以便跳过类型检查,并且行长度是pep-8兼容的?
有什么不对:
option_defaults = (1, 2, "White Horse", "Pumpkin", "Cinderella")
ConfigOption.__new__.__defaults__ = option_defaults # type: ignore
Enum似乎遵循您所需的限制,并且非常简洁。
你可以使用Functional API,它本身就是semantics resemble namedtuple
>>> from enum import Enum
>>> Enum('ConfigOption', 'one two animal vehicle fairytale')
<enum 'ConfigOption'>
>>> ConfigOption = Enum('ConfigOption', 'one two animal vehicle fairytale')
>>> [c for c in ConfigOption]
[<ConfigOption.one: 1>, <ConfigOption.two: 2>, <ConfigOption.animal: 3>, <ConfigOption.vehicle: 4>, <ConfigOption.fairytale: 5>]