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magic methods that allow us to do some pretty neat tricks in object oriented programming. These methods are identified by a two underscores (__) used as prefix and suffix. As example, function as interceptors that are automatically called when certain conditions are met. In python __repr__ is a built-in function used to compute the "official" string representation of an object, while __str__ is a built-in function that computes the "informal" string representations of an object. Example Code Live Demo class String: # magic method to initiate object def __init__(self, string): ... Read More
For our example, we will create two tables and apply Natural Left Join to get the rows from a table not present in the second table. Creating the first table. mysql> create table FirstTableDemo -> ( -> id int, -> name varchar(100) -> ); Query OK, 0 rows affected (0.48 sec) Inserting records into first table. mysql> insert into FirstTableDemo values(1, 'Bob'), (2, 'John'), (3, 'Carol'); Query OK, 3 rows affected (0.13 sec) Records: 3 Duplicates: 0 Warnings: 0 To display all ... Read More
C# and Visual C# are both the same. When you use Visual Studio for C# development, it is called Visual C# .Consider Visual C# as an implementation of C#. Microsoft Visual Studio is an IDE from Microsoft to develop programs, web app, web services, etc. The current version of Visual Studio is Visual Studio 2017, that supports .NET 3.5 to 4.7 framework. C# is a multi-paradigm programming language whose current version is C# 7.3. The following reasons make C# a widely used professional language − It is a modern, general-purpose programming language It is object oriented. It is ... Read More
Non-alphanumeric characters are as follows − @, !, #, &, (), ?, / There is no inbuilt function to remove non-alphanumeric characters from a string in MySQL. Therefore, we create a function which removes all non-alphanumeric characters. The function declaration and definition is as follows. mysql> delimiter // mysql> CREATE FUNCTION RemoveNonAlphaNumeric( s CHAR(255) ) RETURNS CHAR(255) DETERMINISTIC -> BEGIN -> DECLARE var1, length SMALLINT DEFAULT 1; -> DECLARE result CHAR(255) DEFAULT ''; -> DECLARE ch CHAR(1); ... Read More
The ‘L’ suffix concept in MySQL can be related with Python. In Python 2, the long integer literal is suffixed with L or l, but int and long have been binded into int in version 3. Therefore, there is no need for L or l. Adding large numbers in Python Version 3.7 (Python 3), without using any suffix. Here, if we suffix L or l, Python 3 gives an error. However, Python Version 2 suffixed with L or l will not give an error. The following is the output with no error. Hence, Python int is ... Read More
We know that when we solve any image related problem, we have to take a matrix. The matrix content will vary depending upon the image type - either it would be a binary image(0, 1), gray scale image(0-255) or RGB image(255 255 255). So if we want to add of two images then that means very simple we have to add respective two matrices. In OpenCV library, we have a function cv2.add() to add the images. But for image addition the size of the two images should be same. Addition of two images import cv2 # Readingour Image1 my_firstpic ... Read More
The php_strip_whitespace() function returns source with stripped comments and whitespace. Syntax php_strip_whitespace(file_path) Parameters file_path − The path of file. Return The php_strip_whitespace() function returns stripped source code on success. Example The above code strip all the comments and whitespace.
UUID is having the full form Universal Unique Identifier, it is a python library which supports 128 bits ids for generating random objects. Advantages of UUID As discussed, we can use it to generate unique random id for random objects. For cryptography and hashing applications, this id can be used. For generating random documents and also addresses etc. this id can be used. Method1 Using uuid1() Example code import uuid print ("Random id using uuid1() is : ", end="") print (uuid.uuid1()) Output Random id using uuid1() is : 4adeede2-e5d8-11e8-bd27-185e0fd4f8b3 Representations of uuid1() bytes − ... Read More
Here two lists are given. Our task is to check and found weather two given lists are circularly identical or not. Example Input : A = [100, 100, 10, 10, 100] B = [100, 100, 100, 10, 10] Output : True Explanation True as when these elements in the list will circularly rotate then they would be similar to other given list Algorithm Step 1: Create First and Second List. Step 2: Then Lists are converted to map. Step 3: join () method is used for converting the ... Read More
The photomosaic is a technique, where we can split our image into a grid of squares. Each square will be replaced by some other images or colors. So when we want to see the actual image from a certain distance, we can see the actual image, but if we come closer, we can see the grid of different colored blocks. In this case we are using a Python module called photomosaic. Using this module, we can easily create some photomosaics. To install it please follow this link. It will also download the scikit learn module. sudo pip3 install photomosaic ... Read More