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Add an optional `default` argument to trait metadata get, like the Python dict's .get() default argument...
Add an optional `default` argument to trait metadata get, like the Python dict's .get() default argument After this, trait_metadata('traitname', 'metadata_key', DEFAULT) will return DEFAULT if the metadata key is not set. DEFAULT defaults to None, like the existing behavior and like the python dict .get() behavior.

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logoutmain.js
10 lines | 282 B | application/javascript | JavascriptLexer
// Copyright (c) IPython Development Team.
// Distributed under the terms of the Modified BSD License.
var ipython = ipython || {};
require(['base/js/page'], function(page) {
var page_instance = new page.Page();
page_instance.show();
ipython.page = page_instance;
});