{"action":"opened","number":9440,"pull_request":{"url":"https://api.github.com/repos/pydata/pandas/pulls/9440","id":28862428,"html_url":"https://github.com/pydata/pandas/pull/9440","diff_url":"https://github.com/pydata/pandas/pull/9440.diff","patch_url":"https://github.com/pydata/pandas/pull/9440.patch","issue_url":"https://api.github.com/repos/pydata/pandas/issues/9440","number":9440,"state":"open","locked":false,"title":"PROPOSAL: Make Period more low level, like Timestamp","user":{"login":"blbradley","id":1435085,"avatar_url":"https://avatars.githubusercontent.com/u/1435085?v=3","gravatar_id":"","url":"https://api.github.com/users/blbradley","html_url":"https://github.com/blbradley","followers_url":"https://api.github.com/users/blbradley/followers","following_url":"https://api.github.com/users/blbradley/following{/other_user}","gists_url":"https://api.github.com/users/blbradley/gists{/gist_id}","starred_url":"https://api.github.com/users/blbradley/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/blbradley/subscriptions","organizations_url":"https://api.github.com/users/blbradley/orgs","repos_url":"https://api.github.com/users/blbradley/repos","events_url":"https://api.github.com/users/blbradley/events{/privacy}","received_events_url":"https://api.github.com/users/blbradley/received_events","type":"User","site_admin":false},"body":"I propose that Period should be a more basic type, like Timestamp.\r\n\r\nI wanted to start with implementing frequencies with multipliers (see issue #7811), but the code for Period was all over the place.  So, I moved all code directly related to Period to a Cython module. Changed a bit of the logic to make calls from Cython instead of Python to get rid of some Python dependencies. However, the 'meat' of Period is still there. I will be refactoring Period to use Cython over the next week or two.\r\n\r\nI've only done a bit of performance testing, but the results from moving Period are good so far without any real Cython refactoring.\r\n\r\nNote: First commit in this stream is from issue #9415 because I needed that bug fixed to make this work.\r\n\r\nComments most 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