Thanks to some great folks on SO, I discovered the possibilities offered by collections.defaultdict, notably in readability and speed. I have put them to use with success. Now I would like to implement three levels of dictionaries, the two top ones being defaultdict and the lowest one being int. I don’t find the appropriate way … Read more
I know that XHTML doesn’t support nested form tags and I have already read other answers here on Stack Overflow regarding this subject, but I still haven’t figured out an elegant solution to the problem. Some say you don’t need it and that they can’t think of a scenario were this would be needed. Well, … Read more
WITH y AS ( WITH x AS ( SELECT * FROM MyTable ) SELECT * FROM x ) SELECT * FROM y Does something like this work? I tried it earlier but I couldn’t get it to work. 7 Answers 7
I’m writing an SQL Query, where a few of the columns returned need to be calculated depending on quite a lot of conditions. I’m currently using nested case statements, but its getting messy. Is there a better (more organised and/or readable) way? (I am using Microsoft SQL Server, 2005) A simplified example: SELECT col1, col2, … Read more
Can someone please point me towards some nice resources for understanding and using nested classes? I have some material like Programming Principles and things like this IBM Knowledge Center – Nested Classes But I’m still having trouble understanding their purpose. Could someone please help me? 6 Answers 6
I recently got stuck in a situation like this: class A { public: typedef struct/class {…} B; … C::D *someField; } class C { public: typedef struct/class {…} D; … A::B *someField; } Usually you can declare a class name: class A; But you can’t forward declare a nested type, the following causes compilation error. … Read more
This question already has answers here: Regular expression to match balanced parentheses (21 answers) Closed 3 years ago. Is it possible to write a regular expression that matches a nested pattern that occurs an unknown number of times? For example, can a regular expression match an opening and closing brace when there are an unknown … Read more
I have a problem when querying mongoDB with nested objects notation: db.messages.find( { headers : { From: “[email protected]” } } ).count() 0 db.messages.find( { ‘headers.From’: “[email protected]” } ).count() 5 I can’t see what I am doing wrong. I am expecting nested object notation to return the same result as the dot notation query. Where am … Read more
I have this nested list: l = [[’40’, ’20’, ’10’, ’30’], [’20’, ’20’, ’20’, ’20’, ’20’, ’30’, ’20’], [’30’, ’20’, ’30’, ’50’, ’10’, ’30’, ’20’, ’20’, ’20’], [‘100’, ‘100’], [‘100’, ‘100’, ‘100’, ‘100’, ‘100’], [‘100’, ‘100’, ‘100’, ‘100’]] Now, what I want to do is convert each element in a list to float. My solution … Read more
I am currently struggling with nesting routes using react router v4. The closest example was the route config in the React-Router v4 Documentation. I want to split my app in 2 different parts. A frontend and an admin area. I was thinking about something like this: <Match pattern=”https://stackoverflow.com/” component={Frontpage}> <Match pattern=”/home” component={HomePage} /> <Match pattern=”/about” … Read more
