{"action":"created","comment":{"url":"https://api.github.com/repos/pydata/pandas/pulls/comments/42946112","id":42946112,"diff_hunk":"@@ -3170,6 +3235,18 @@ def __array__(self, dtype=None):\n         \"\"\" the array interface, return my values \"\"\"\n         return np.array(self._data, dtype=dtype)\n \n+    @cache_readonly\n+    def _isnan(self):\n+        \"\"\" return if each value is nan\"\"\"\n+        return self._data.codes == -1\n+\n+    @Appender(_index_shared_docs['fillna'])\n+    def fillna(self, value, downcast=None):\n+        if not lib.isscalar(value):","path":"pandas/core/index.py","position":146,"original_position":146,"commit_id":"5e1fff8739f0e63b90311ac3f9ca422eba3114b6","original_commit_id":"c08ac92204b6c8ecd3b630cc9d50ceaf7417ffad","user":{"login":"sinhrks","id":1696302,"avatar_url":"https://avatars.githubusercontent.com/u/1696302?v=3","gravatar_id":"","url":"https://api.github.com/users/sinhrks","html_url":"https://github.com/sinhrks","followers_url":"https://api.github.com/users/sinhrks/followers","following_url":"https://api.github.com/users/sinhrks/following{/other_user}","gists_url":"https://api.github.com/users/sinhrks/gists{/gist_id}","starred_url":"https://api.github.com/users/sinhrks/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sinhrks/subscriptions","organizations_url":"https://api.github.com/users/sinhrks/orgs","repos_url":"https://api.github.com/users/sinhrks/repos","events_url":"https://api.github.com/users/sinhrks/events{/privacy}","received_events_url":"https://api.github.com/users/sinhrks/received_events","type":"User","site_admin":false},"body":"@jreback This is to use ``Categorical.fillna`` rather than ``putmask``. Is there any better way to do this?","created_at":"2015-10-25T15:35:46Z","updated_at":"2015-10-25T15:35:46Z","html_url":"https://github.com/pydata/pandas/pull/11343#discussion_r42946112","pull_request_url":"https://api.github.com/repos/pydata/pandas/pulls/11343","_links":{"self":{"href":"https://api.github.com/repos/pydata/pandas/pulls/comments/42946112"},"html":{"href":"https://github.com/pydata/pandas/pull/11343#discussion_r42946112"},"pull_request":{"href":"https://api.github.com/repos/pydata/pandas/pulls/11343"}}},"pull_request":{"url":"https://api.github.com/repos/pydata/pandas/pulls/11343","id":47916453,"html_url":"https://github.com/pydata/pandas/pull/11343","diff_url":"https://github.com/pydata/pandas/pull/11343.diff","patch_url":"https://github.com/pydata/pandas/pull/11343.patch","issue_url":"https://api.github.com/repos/pydata/pandas/issues/11343","number":11343,"state":"open","locked":false,"title":"ENH: Add Index.fillna","user":{"login":"sinhrks","id":1696302,"avatar_url":"https://avatars.githubusercontent.com/u/1696302?v=3","gravatar_id":"","url":"https://api.github.com/users/sinhrks","html_url":"https://github.com/sinhrks","followers_url":"https://api.github.com/users/sinhrks/followers","following_url":"https://api.github.com/users/sinhrks/following{/other_user}","gists_url":"https://api.github.com/users/sinhrks/gists{/gist_id}","starred_url":"https://api.github.com/users/sinhrks/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sinhrks/subscriptions","organizations_url":"https://api.github.com/users/sinhrks/orgs","repos_url":"https://api.github.com/users/sinhrks/repos","events_url":"https://api.github.com/users/sinhrks/events{/privacy}","received_events_url":"https://api.github.com/users/sinhrks/received_events","type":"User","site_admin":false},"body":"Closes #10089. \r\n\r\n- ``value`` can only accept scalar.\r\n- ``MultiIndex.fillna`` raises 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