nested

问题 I have code similar to the following: class B { } class A { enum { EOne, ETwo } EMyEnum; B myB; } I want to declare a member of type EMyEnum in class B (which is declared before A). Is this possible? I realise the solution is to declare class B second, but for clarity I would prefer not to. 回答1: It's not possible... but it can be faked with inheritance abuse :) namespace detail { class A_EMyEnum { public: enum { EOne, ETwo } EMyEnum; protected: A_EMyEnum() {} A_EMyEnum(const A_EMyEnum&) {} A

问题 I have a case where I need to construct following structure programmatically (yes I am aware of .setdefault and defaultdict but I can not get what I want) I basically need a dictionary, with a dictionary of dictionaries created within the loop. At the beginning the structure is completely blank. structure sample (please note, I want to create an array that has this structure in the code!) RULE = { 'hard_failure': { 4514 : { 'f_expr' = 'ABC', 'c_expr' = 'XF0', } } } pseudo code that needs to

问题 Here's a good article on creating links inside of larger clickable areas: http://css-tricks.com/links-inside-of-larger-clickable-areas/ This solution requires JavaScript. At the end of the article, there's a broken link to a CSS-only solution (so apparently it can be done), but I can't figure out how this would be done with CSS only. Any ideas? 回答1: Doesn't seem too difficult to me (JSFiddle). HTML: <header> <a href="#1">Clickable</a> <nav> <ul> <li> <a href="#2">Clickable</a> </li> <li> <a

问题 I have a table in a page that consists of checkboxes in the cells on the left and descriptions in the cells on the right. The "description" contains h4 headers and plain text. I want to make that whole description (everything inside <td></td> ) a label. So each row looks like this: <tr><td><input type="checkbox" name="entiries[]" value="i1" id="i1"></td> <td><label for="i1"> <h4>Some stuff</h4>more stuff.. <h4>Some stuff</h4>more stuff.. </label> </td></tr> This does not work however, the

问题 I am trying to update values in a nested dictionary, without over-writting previous entries when the key already exists. For example, I have a dictionary: myDict = {} myDict["myKey"] = { "nestedDictKey1" : aValue } giving, print myDict >> { "myKey" : { "nestedDictKey1" : aValue }} Now, I want to add another entry , under "myKey" myDict["myKey"] = { "nestedDictKey2" : anotherValue }} This will return: print myDict >> { "myKey" : { "nestedDictKey2" : anotherValue }} But I want: print myDict >>

问题 Nested dictionary has a length of 12, this is one of the records: {('ALEXANDER', 'MALE'): {'2010': ('2619', None), '2011': ('2494', None), '2009': ('2905', None)}, ... Main key = ('ALEXANDER', 'MALE') Main value (which is nested dictionary) = {'2010': ('2619', None), '2011': ('2494', None), '2009': ('2905', None)} Nested dictionary key/value = '2010': ('2619', None) ... How would one access the year '2010' and the value '2619' ? Is it possible to do this using variables? 回答1: This may point

问题 Ok, so I have the following query: SELECT MIN(`date`), `player_name` FROM `player_playtime` GROUP BY `player_name` I then need to use this result inside the following query: SELECT DATE(`date`) , COUNT(DISTINCT `player_name`) FROM `player_playtime /*Use previous query result here*/` GROUP BY DATE( `date`) DESC LIMIT 60 How would I go about doing this? 回答1: You just need to write the first query as a subquery (derived table), inside parentheses, pick an alias for it ( t below) and alias the

问题 I'm very new to python and I wish I could do . notation to access values of a dict . Lets say I have test like this: >>> test = dict() >>> test['name'] = 'value' >>> print(test['name']) value But I wish I could do test.name to get value . Infact I did it by overriding the __getattr__ method in my class like this: class JuspayObject: def __init__(self,response): self.__dict__['_response'] = response def __getattr__(self,key): try: return self._response[key] except KeyError,err: sys.stderr

问题 I have a ViewPager on the root-level of an activity. Each page of the pager contains a ListFragment (backed by a FragmentPagerAdapter). Some of the list view items should contain additionally ViewPagers to support swiping the content of those items (e. g. a horizontal gallery inside a list item). How can I nest view pagers? ViewPager -> ListView (in a page) -> ViewPager (inside a list item) I can swipe between the ListFragments horizontally and I can swipe the whole list vertically, but I

问题 i need to format the contents of a Json file in a certain format in a pandas DataFrame so that i can run pandassql to transform the data and run it through a scoring model. file = C:\scoring_model\json.js (contents of 'file' are below) { "response":{ "version":"1.1", "token":"dsfgf", "body":{ "customer":{ "customer_id":"1234567", "verified":"true" }, "contact":{ "email":"mr@abc.com", "mobile_number":"0123456789" }, "personal":{ "gender": "m", "title":"Dr.", "last_name":"Muster", "first_name":