{"action":"created","issue":{"url":"https://api.github.com/repos/sympy/sympy/issues/10200","labels_url":"https://api.github.com/repos/sympy/sympy/issues/10200/labels{/name}","comments_url":"https://api.github.com/repos/sympy/sympy/issues/10200/comments","events_url":"https://api.github.com/repos/sympy/sympy/issues/10200/events","html_url":"https://github.com/sympy/sympy/issues/10200","id":120618191,"number":10200,"title":"Error of having more than one variables when there are none","user":{"login":"mafiya69","id":7235212,"avatar_url":"https://avatars.githubusercontent.com/u/7235212?v=3","gravatar_id":"","url":"https://api.github.com/users/mafiya69","html_url":"https://github.com/mafiya69","followers_url":"https://api.github.com/users/mafiya69/followers","following_url":"https://api.github.com/users/mafiya69/following{/other_user}","gists_url":"https://api.github.com/users/mafiya69/gists{/gist_id}","starred_url":"https://api.github.com/users/mafiya69/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mafiya69/subscriptions","organizations_url":"https://api.github.com/users/mafiya69/orgs","repos_url":"https://api.github.com/users/mafiya69/repos","events_url":"https://api.github.com/users/mafiya69/events{/privacy}","received_events_url":"https://api.github.com/users/mafiya69/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/sympy/sympy/labels/Easy%20to%20Fix","name":"Easy to Fix","color":"009800"}],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":2,"created_at":"2015-12-06T08:30:36Z","updated_at":"2015-12-06T12:57:24Z","closed_at":null,"body":"```\r\nIn [0] : class Test(Expr):\r\n                        _diff_wrt = True\r\nIn [1]: t = Test()\r\nIn [2]: t.free_symbols\r\nOut[2]: set([])\r\nIn [3]: t.diff()\r\n        ValueError: \r\n        Since there is more than one variable in the expression, the\r\n        variable(s) of differentiation must be supplied to differentiate\r\n        Test()\r\n```"},"comment":{"url":"https://api.github.com/repos/sympy/sympy/issues/comments/162313641","html_url":"https://github.com/sympy/sympy/issues/10200#issuecomment-162313641","issue_url":"https://api.github.com/repos/sympy/sympy/issues/10200","id":162313641,"user":{"login":"tokencolour","id":9028362,"avatar_url":"https://avatars.githubusercontent.com/u/9028362?v=3","gravatar_id":"","url":"https://api.github.com/users/tokencolour","html_url":"https://github.com/tokencolour","followers_url":"https://api.github.com/users/tokencolour/followers","following_url":"https://api.github.com/users/tokencolour/following{/other_user}","gists_url":"https://api.github.com/users/tokencolour/gists{/gist_id}","starred_url":"https://api.github.com/users/tokencolour/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/tokencolour/subscriptions","organizations_url":"https://api.github.com/users/tokencolour/orgs","repos_url":"https://api.github.com/users/tokencolour/repos","events_url":"https://api.github.com/users/tokencolour/events{/privacy}","received_events_url":"https://api.github.com/users/tokencolour/received_events","type":"User","site_admin":false},"created_at":"2015-12-06T12:57:24Z","updated_at":"2015-12-06T12:57:24Z","body":"@mafiya69 @kshitij10496 @leosartaj Would you mind if I look into this? "}}