{"action":"created","comment":{"url":"https://api.github.com/repos/pandas-dev/pandas/pulls/comments/136036788","pull_request_review_id":59519168,"id":136036788,"diff_hunk":"@@ -1,6 +1,9 @@\n-from pandas.core.indexes.base import (Index, _new_Index,  # noqa\n-                                 _ensure_index, _get_na_value,\n-                                 InvalidIndexError)\n+from pandas.core.indexes.base import (Index,\n+                                      _new_Index,\n+                                      _ensure_index,","path":"pandas/core/indexes/api.py","position":6,"original_position":6,"commit_id":"047bda0035a273bea3b0429cea76f616c6ea444e","original_commit_id":"047bda0035a273bea3b0429cea76f616c6ea444e","user":{"login":"jreback","id":953992,"avatar_url":"https://avatars2.githubusercontent.com/u/953992?v=4","gravatar_id":"","url":"https://api.github.com/users/jreback","html_url":"https://github.com/jreback","followers_url":"https://api.github.com/users/jreback/followers","following_url":"https://api.github.com/users/jreback/following{/other_user}","gists_url":"https://api.github.com/users/jreback/gists{/gist_id}","starred_url":"https://api.github.com/users/jreback/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jreback/subscriptions","organizations_url":"https://api.github.com/users/jreback/orgs","repos_url":"https://api.github.com/users/jreback/repos","events_url":"https://api.github.com/users/jreback/events{/privacy}","received_events_url":"https://api.github.com/users/jreback/received_events","type":"User","site_admin":false},"body":"k","created_at":"2017-08-30T11:01:34Z","updated_at":"2017-08-30T11:01:34Z","html_url":"https://github.com/pandas-dev/pandas/pull/17236#discussion_r136036788","pull_request_url":"https://api.github.com/repos/pandas-dev/pandas/pulls/17236","author_association":"CONTRIBUTOR","_links":{"self":{"href":"https://api.github.com/repos/pandas-dev/pandas/pulls/comments/136036788"},"html":{"href":"https://github.com/pandas-dev/pandas/pull/17236#discussion_r136036788"},"pull_request":{"href":"https://api.github.com/repos/pandas-dev/pandas/pulls/17236"}},"in_reply_to_id":136032207},"pull_request":{"url":"https://api.github.com/repos/pandas-dev/pandas/pulls/17236","id":135456637,"html_url":"https://github.com/pandas-dev/pandas/pull/17236","diff_url":"https://github.com/pandas-dev/pandas/pull/17236.diff","patch_url":"https://github.com/pandas-dev/pandas/pull/17236.patch","issue_url":"https://api.github.com/repos/pandas-dev/pandas/issues/17236","number":17236,"state":"open","locked":false,"title":"API: Have MultiIndex consturctors always return a MI","user":{"login":"TomAugspurger","id":1312546,"avatar_url":"https://avatars3.githubusercontent.com/u/1312546?v=4","gravatar_id":"","url":"https://api.github.com/users/TomAugspurger","html_url":"https://github.com/TomAugspurger","followers_url":"https://api.github.com/users/TomAugspurger/followers","following_url":"https://api.github.com/users/TomAugspurger/following{/other_user}","gists_url":"https://api.github.com/users/TomAugspurger/gists{/gist_id}","starred_url":"https://api.github.com/users/TomAugspurger/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/TomAugspurger/subscriptions","organizations_url":"https://api.github.com/users/TomAugspurger/orgs","repos_url":"https://api.github.com/users/TomAugspurger/repos","events_url":"https://api.github.com/users/TomAugspurger/events{/privacy}","received_events_url":"https://api.github.com/users/TomAugspurger/received_events","type":"User","site_admin":false},"body":"This removes the special case for MultiIndex constructors returning\r\nan Index if all the levels are length-1. Now this will return a\r\nMultiIndex with a single level.\r\n\r\nThis is a backwards incompatabile change, with no clear method for\r\ndeprecation, so we're making a clean break.\r\n\r\nOld Behavior:\r\n\r\n```python\r\nIn [1]: import pandas as pd\r\n\r\nIn [2]: pd.MultiIndex.from_tuples([('a',), ('b',)])\r\nOut[2]: Index(['a', 'b'], dtype='object')\r\n\r\n```\r\n\r\nNew:\r\n\r\n```python\r\nIn [1]: import pandas as pd\r\nIn [2]: pd.MultiIndex.from_tuples([('a',), ('b',)])\r\nOut[2]:\r\nMultiIndex(levels=[['a', 'b']],\r\n           labels=[[0, 1]])\r\n```\r\n\r\nCloses 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