{"action":"opened","issue":{"url":"https://api.github.com/repos/sympy/sympy/issues/12230","repository_url":"https://api.github.com/repos/sympy/sympy","labels_url":"https://api.github.com/repos/sympy/sympy/issues/12230/labels{/name}","comments_url":"https://api.github.com/repos/sympy/sympy/issues/12230/comments","events_url":"https://api.github.com/repos/sympy/sympy/issues/12230/events","html_url":"https://github.com/sympy/sympy/issues/12230","id":210720050,"number":12230,"title":"Write documentation and examples to UnevaluatedExpr","user":{"login":"Upabjojr","id":4128856,"avatar_url":"https://avatars.githubusercontent.com/u/4128856?v=3","gravatar_id":"","url":"https://api.github.com/users/Upabjojr","html_url":"https://github.com/Upabjojr","followers_url":"https://api.github.com/users/Upabjojr/followers","following_url":"https://api.github.com/users/Upabjojr/following{/other_user}","gists_url":"https://api.github.com/users/Upabjojr/gists{/gist_id}","starred_url":"https://api.github.com/users/Upabjojr/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Upabjojr/subscriptions","organizations_url":"https://api.github.com/users/Upabjojr/orgs","repos_url":"https://api.github.com/users/Upabjojr/repos","events_url":"https://api.github.com/users/Upabjojr/events{/privacy}","received_events_url":"https://api.github.com/users/Upabjojr/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2017-02-28T08:36:08Z","updated_at":"2017-02-28T08:36:08Z","closed_at":null,"body":"The class `sympy.core.expr.UnevaluatedExpr` can potentially be very useful.\r\n\r\n- Write some documentation as to its usages in the tutorials and/or introduction to SymPy.\r\n- Especially important, mark the difference between `UnevaluatedExpr` and `evaluate=False`.\r\n\r\nRelated on StackOverflow: http://stackoverflow.com/questions/42486283/preventing-a-multiplication-expression-evaluating-in-sympy/42503593#42503593"}}
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