AttributeError: 'TraitCompound' object has no attribute 'clone'

Question

假设我想使用 Traits 包创建一个 "bases" 属性，它可以是一个 'none' 字符串或一个字典，其键是 'hrf' 或 'fourier' 或 ' fourier_han' 或 'gamma' 或 'fir' 并且值是一个字典，键是 'derivs' 或 'length' 或 'order' 并且值是列表或浮点数）。例如：

碱基 == 'none'
或
碱基 == {'hrf': {'derivs': [0, 0]}}
或
碱基 == {'fourier': {'length': 1.4, 'order': 3}}

如果我定义一个 'none' 字符串或字典，其键为 'hrf' 或 'fourier' 或 'fourier_han' 或 'gamma' 或 'fir' 且值为键为 'derivs' 或 'length' 或 'order' 且值为列表的字典）它工作正常：

>>> import traits.api as traits
>>> class Foo(traits.HasTraits):
...  bases = traits.Either(traits.Dict(traits.Enum("hrf","fourier","fourier_han","gamma","fir"),traits.Dict(traits.Enum("derivs","length","order"), traits.List)),'none',default={"hrf":{"derivs":[0,0]}})
... 
>>> foo=Foo()
>>> foo.bases
{'hrf': {'derivs': [0, 0]}}

但这并不是我想要的。如果现在我尝试提供在内部字典中使用 list 或 float 的可能性，它是行不通的：

 >>> import traits.api as traits
 >>> class Foo(traits.HasTraits):
...  bases = traits.Either(traits.Dict(traits.Enum("hrf","fourier","fourier_han","gamma","fir"),traits.Dict(traits.Enum("derivs","length","order"), traits.Either(traits.List, traits.Float))),'none',default={"hrf":{"derivs":[0,0]}})
... 
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 2, in Foo
  File "/home/econdami/.local/lib/python3.7/site-packages/traits/trait_types.py", line 2804, in __init__
    handler = handler.clone()
AttributeError: 'TraitCompound' object has no attribute 'clone'

为什么？

Answer 1

这不是我第一次与开发 Traits 项目的团队互动。

As always, they very quickly managed to solve the problem and gave a very detailed answer on it.

简而言之，早在Traits 6.1，一方面，更喜欢：

traits.Union(traits.Float, traits.List)

至

traits.Either(traits.Float, traits.List)

另一方面，请注意 Union() 的 default_value 参数（Either() 的 default）。最好用其他方式初始化。

AttributeError: 'TraitCompound' object has no attribute 'clone'

AttributeError: 'TraitCompound' object has no attribute 'clone'

python

enthought