{"action":"opened","issue":{"url":"https://api.github.com/repos/pydata/pandas/issues/9645","labels_url":"https://api.github.com/repos/pydata/pandas/issues/9645/labels{/name}","comments_url":"https://api.github.com/repos/pydata/pandas/issues/9645/comments","events_url":"https://api.github.com/repos/pydata/pandas/issues/9645/events","html_url":"https://github.com/pydata/pandas/issues/9645","id":61088788,"number":9645,"title":"ENH: add read_csv sniffing (sep=None) for C engine","user":{"login":"jorisvandenbossche","id":1020496,"avatar_url":"https://avatars.githubusercontent.com/u/1020496?v=3","gravatar_id":"","url":"https://api.github.com/users/jorisvandenbossche","html_url":"https://github.com/jorisvandenbossche","followers_url":"https://api.github.com/users/jorisvandenbossche/followers","following_url":"https://api.github.com/users/jorisvandenbossche/following{/other_user}","gists_url":"https://api.github.com/users/jorisvandenbossche/gists{/gist_id}","starred_url":"https://api.github.com/users/jorisvandenbossche/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jorisvandenbossche/subscriptions","organizations_url":"https://api.github.com/users/jorisvandenbossche/orgs","repos_url":"https://api.github.com/users/jorisvandenbossche/repos","events_url":"https://api.github.com/users/jorisvandenbossche/events{/privacy}","received_events_url":"https://api.github.com/users/jorisvandenbossche/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2015-03-13T15:05:22Z","updated_at":"2015-03-13T15:05:22Z","closed_at":null,"body":"If you now do `pd.read_csv(myfile.csv, sep=None)`, you get the warning:\r\n\r\n> ParserWarning: Falling back to the 'python' engine because the 'c' engine does not support sep=None with delim_whitespace=False; you can avoid this warning by specifying engine='python'\r\n\r\nIs this warning correct that it is not implemented for the c engine? \r\nIf so, it could maybe be added."}}