python - 为什么collections.Counter是大写而collections.defaultdict不是？

Question

collections 模块中的某些元素似乎是大写的，而另一些则不是。其背后有具体的理由吗？

Answer 1

根据this Reddit 评论

All classes written in python are upper camel case.

All types based on C code are lower. [like the primitives]

namedtuple is a function, thus follows the naming convention of functions. deque and defaultdict are types, (C); Counter and OrderedDict are classes, (Python).