将CheckListEditor与List（Str）以外的其他东西一起使用

Question

__str__是否能够处理不是字符串而是实现__str__和__repr__的对象列表？

Answer 1

Not as such. CheckListEditor assumes that values are either strings or tuples of (element, string). It uses isinstance(basestring) on the objects to check whether they are strings, and if not it assumes they are tuples of (element,string).

In some cases it is not especially convenient to provide tuples of (element,string). Mainly this is true when the element in the list is a trait from the model object -- providing a trait of (element,name) tuples is a bit awkward. However, implementing indexing is a convenient workaround (or atrocious hack) which fools CheckListEditor into thinking that (element,name) tuples is what its getting.

class Nameable(HasTraits)

  def __repr__(self): return "Some String Representation"

  def __getitem__(self,key):
    if key==0: return self
    elif key==1: return self.__repr__()
    else: raise KeyError