Currently they wrap them into pvector which is not as efficient as it could be in Python 3.
贡献者指南
技术栈
python
领域
data
议题类型
feature
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
3
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
1-3 hours
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
stale
清晰度议题是否清楚说明期望改动、验收标准和下一步。
needs investigation
前置要求
Python 3 knowledgepyrsistent internals
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
40
研究方向
The issue requests making PMap.keys(), .values(), and .items() return proper iterables instead of wrapping results in pvector. The current implementation is in the source file for PMap, likely in pyrsistent/ pmap.py. The contributor should examine the methods and understand how to return view objects or generators. The 3 comments may contain hints, but are not shown here. No linked PRs exist, so the work is still open.
PMap values, keys, and items should be iterables in Python 3 · tobgu/pyrsistent#159 | Good First Issue
