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To encode custom python objects as BSON with Pymongo, you have to write a SONManipulator. From the docs:SONManipulator instances allow you to specify transformations to be applied automatically by PyMongo.from pymongo.son_manipulator import SONManipulator class Transform(SONManipulator): def transform_incoming(self, son, collection): for (key, value) in son.items(): if isinstance(value, Custom): son[key] = encode_custom(value) elif isinstance(value, dict): # Make sure we recurse into sub-docs son[key] = self.transform_incoming(value, collection) return son def transform_outgoing(self, son, collection): for (key, value) in son.items(): ... Read More
To detect if there is any cycle in the undirected graph or not, we will use the DFS traversal for the given graph. For every visited vertex v, when we have found any adjacent vertex u, such that u is already visited, and u is not the parent of vertex v. Then one cycle is detected. We will assume that there are no parallel edges for any pair of vertices.Input and Output: Adjacency matrix 0 1 0 0 0 1 0 1 1 0 0 1 0 0 1 0 1 ... Read More
Using a Depth First Search (DFS) traversal algorithm we can detect cycles in a directed graph. If there is any self-loop in any node, it will be considered as a cycle, otherwise, when the child node has another edge to connect its parent, it will also a cycle.For the disconnected graph, there may different trees present, we can call them a forest. Now we have to detect cycle for all trees of the forest.In this approach, we will use different sets to assign nodes to perform the DFS traversal. There are three different sets, the White, Grey and the Black. ... Read More
The Euler path is a path, by which we can visit every edge exactly once. We can use the same vertices for multiple times. The Euler Circuit is a special type of Euler path. When the starting vertex of the Euler path is also connected with the ending vertex of that path, then it is called the Euler Circuit.To check whether a graph is Eulerian or not, we have to check two conditions −The graph must be connected.The in-degree and out-degree of each vertex must be the same.Input and OutputInput: Adjacency matrix of the graph. 0 1 0 0 0 ... Read More
Yes, you can define an interface inside a class and it is known as a nested interface. You can’t access a nested interface directly; you need to access (implement) the nested interface using the inner class or by using the name of the class holding this nested interface.ExampleLive Demopublic class Sample { interface myInterface { void demo(); } class Inner implements myInterface { public void demo() { System.out.println("Welcome to Tutorialspoint"); } } public static void main(String args[]) { Inner obj ... Read More
Generally, to print the contents of an array you need to use for loops, in addition to that you can directly print an array using the toString() method of this class. This method accepts an array as a parameter and returns it in String format.ExampleLive Demoimport java.util.Arrays; public class PrintingArrays { public static void main(String args[]) { int[] myArray = {23, 93, 30, 56, 92, 39}; System.out.println(Arrays.toString(myArray)); } }Output[23, 93, 30, 56, 92, 39]
The flex-column-reverse is used to display reversed flex items with vertical orientation. Add the flex-column-reverse class as in the following code snippet −After that, add flex items inside it − Demo 1 Demo 2 Demo 3 You can try to run the following code to show flex items vertically and reversed −ExampleLive Demo Bootstrap Example Implementing Column Reverse Demo 1 Demo 2 Demo 3
The Arrays class of the java.util package provides you a method named asList(). This method accepts an array (of objects) and converts them into a list and returns it.ExampleLive Demoimport java.util.Arrays; import java.util.List; public class ArrayToList { public static void main(String args[]) { Integer[] myArray = {23, 93, 56, 92, 39}; List list = Arrays.asList(myArray); System.out.println(list); } }Output[23, 93, 56, 92, 39]
Java does not support the concept of default parameter however, you can achieve this usingMethod overloadingUsing method overloading if you define method with no arguments along with parametrized methods. Then you can call a method with zero arguments.Variable argumentsIn Java methods parameters accept arguments with three dots. These are known as variable arguments. Once you use variable arguments as a parameter method, while calling you can pass as many number of arguments to this method (variable number of arguments) or, you can simply call this method without passing any arguments.ExampleLive Demopublic class Sample { void demoMethod(String... args) { ... Read More
In JavaScript, the functions wrapped with parenthesis are called “Immediately Invoked Function Expressions" or "Self Executing Functions.The purpose of wrapping is to namespace and control the visibility of member functions. It wraps code inside a function scope and decrease clashing with other libraries. This is what we call Immediately Invoked Function Expression (IIFE) or Self Executing Anonymous Function.Here’s the syntax −(function() { // code })();As you can see above, the following pair of parentheses converts the code inside the parentheses into an expression −function(){...}In addition, the next pair, i.e. the second pair of parentheses continues the operation. It calls ... Read More