{"action":"created","comment":{"url":"https://api.github.com/repos/pydata/pandas/pulls/comments/60801852","id":60801852,"diff_hunk":"@@ -786,17 +786,25 @@ def read(self, nrows=None):\n             return ret\n \n         # May alter columns / col_dict\n-        index, columns, col_dict = self._create_index(ret)\n+        index, columns, mappings, col_dict = self._create_index(ret)\n \n-        df = DataFrame(col_dict, columns=columns, index=index)\n+        if not mappings:","path":"pandas/io/parsers.py","position":8,"original_position":8,"commit_id":"5c9d1547e3c93859bbfdfa85e80a50c54cca99a3","original_commit_id":"0a0246d15746353f6ba1ca95822deec8591a9679","user":{"login":"jreback","id":953992,"avatar_url":"https://avatars.githubusercontent.com/u/953992?v=3","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":"well, those are easy\r\n\r\n```\r\ncolumns = list_of_column_names (from names or header)\r\ndata = list_of_ndarrays\r\n\r\nnew_columns = []\r\nnew_data = []\r\nfor i, (c, d) in enumerate(zip(columns, data)):\r\n       if (do_parse_dates thing):\r\n           ....\r\n       if usecols things:\r\n           ...\r\n       else:\r\n          new_columns.append(c)\r\n          new_data.append(d)\r\n\r\nresult = pd.concat(map(Series,new_data),axis=1)\r\nresult.columns=new_columns\r\n```","created_at":"2016-04-22T20:55:47Z","updated_at":"2016-04-22T20:55:47Z","html_url":"https://github.com/pydata/pandas/pull/12935#discussion_r60801852","pull_request_url":"https://api.github.com/repos/pydata/pandas/pulls/12935","_links":{"self":{"href":"https://api.github.com/repos/pydata/pandas/pulls/comments/60801852"},"html":{"href":"https://github.com/pydata/pandas/pull/12935#discussion_r60801852"},"pull_request":{"href":"https://api.github.com/repos/pydata/pandas/pulls/12935"}}},"pull_request":{"url":"https://api.github.com/repos/pydata/pandas/pulls/12935","id":67215781,"html_url":"https://github.com/pydata/pandas/pull/12935","diff_url":"https://github.com/pydata/pandas/pull/12935.diff","patch_url":"https://github.com/pydata/pandas/pull/12935.patch","issue_url":"https://api.github.com/repos/pydata/pandas/issues/12935","number":12935,"state":"open","locked":false,"title":"BUG, ENH: Add support for parsing duplicate columns","user":{"login":"gfyoung","id":9273653,"avatar_url":"https://avatars.githubusercontent.com/u/9273653?v=3","gravatar_id":"","url":"https://api.github.com/users/gfyoung","html_url":"https://github.com/gfyoung","followers_url":"https://api.github.com/users/gfyoung/followers","following_url":"https://api.github.com/users/gfyoung/following{/other_user}","gists_url":"https://api.github.com/users/gfyoung/gists{/gist_id}","starred_url":"https://api.github.com/users/gfyoung/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/gfyoung/subscriptions","organizations_url":"https://api.github.com/users/gfyoung/orgs","repos_url":"https://api.github.com/users/gfyoung/repos","events_url":"https://api.github.com/users/gfyoung/events{/privacy}","received_events_url":"https://api.github.com/users/gfyoung/received_events","type":"User","site_admin":false},"body":"Introduces `mappings` and `reverse_map` attributes to the parser in `pandas.io.parsers` that allow it to differentiate between duplicate columns that may be present in a file.\r\n\r\nCloses #7160.","created_at":"2016-04-20T16:14:12Z","updated_at":"2016-04-22T20:55:47Z","closed_at":null,"merged_at":null,"merge_commit_sha":"37d3689da11f5f7207c5237c517b186e1e5cba43","assignee":null,"milestone":null,"commits_url":"https://api.github.com/repos/pydata/pandas/pulls/12935/commits","review_comments_url":"https://api.github.com/repos/pydata/pandas/pulls/12935/comments","review_comment_url":"https://api.github.com/repos/pydata/pandas/pulls/comments{/number}","comments_url":"https://api.github.com/repos/pydata/pandas/issues/12935/comments","statuses_url":"https://api.github.com/repos/pydata/pandas/statuses/5c9d1547e3c93859bbfdfa85e80a50c54cca99a3","head":{"label":"gfyoung:dupe-col-names","ref":"dupe-col-names","sha":"5c9d1547e3c93859bbfdfa85e80a50c54cca99a3","user":{"login":"gfyoung","id":9273653,"avatar_url":"https://avatars.githubusercontent.com/u/9273653?v=3","gravatar_id":"","url":"https://api.github.com/users/gfyoung","html_url":"https://github.com/gfyoung","followers_url":"https://api.github.com/users/gfyoung/followers","following_url":"https://api.github.com/users/gfyoung/following{/other_user}","gists_url":"https://api.github.com/users/gfyoung/gists{/gist_id}","starred_url":"https://api.github.com/users/gfyoung/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/gfyoung/subscriptions","organizations_url":"https://api.github.com/users/gfyoung/orgs","repos_url":"https://api.github.com/users/gfyoung/repos","events_url":"https://api.github.com/users/gfyoung/events{/privacy}","received_events_url":"https://api.github.com/users/gfyoung/received_events","type":"User","site_admin":false},"repo":{"id":51449909,"name":"pandas","full_name":"gfyoung/pandas","owner":{"login":"gfyoung","id":9273653,"avatar_url":"https://avatars.githubusercontent.com/u/9273653?v=3","gravatar_id":"","url":"https://api.github.com/users/gfyoung","html_url":"https://github.com/gfyoung","followers_url":"https://api.github.com/users/gfyoung/followers","following_url":"https://api.github.com/users/gfyoung/following{/other_user}","gists_url":"https://api.github.com/users/gfyoung/gists{/gist_id}","starred_url":"https://api.github.com/users/gfyoung/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/gfyoung/subscriptions","organizations_url":"https://api.github.com/users/gfyoung/orgs","repos_url":"https://api.github.com/users/gfyoung/repos","events_url":"https://api.github.com/users/gfyoung/events{/privacy}","received_events_url":"https://api.github.com/users/gfyoung/received_events","type":"User","site_admin":false},"private":false,"html_url":"https://github.com/gfyoung/pandas","description":"Flexible 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