Server Side Programming Articles - Page 1323 of 2650

XML stands for "Extensible Markup Language". It is mainly used in webpages, where the data has a specific structure. It has elements, defined by a beginning and an ending tag. A tag is a markup construct that begins with < and ends with >. The characters between the start-tag and end-tag, are the element's content. Elements can contain other elements, which are called "child elements".ExampleBelow is the example of an XML file we are going to use in this tutorial.           Vicky, Matthew       Geo-Spatial Data Analysis       Python     ... Read More

Python does not have a null object. But the most closely related similar object is none. In this article, we will see how how None behaves in Python.Checking the type of Null and None we see that there is no Null Type and the None object is of type NoneType.Exampleprint(type(None)) print(type(Null))OutputRunning the above code gives us the following result −Traceback (most recent call last):    File "C:\Users\xxx\scratch.py", line 4, in       print(type(Null)) NameError: name 'Null' is not definedKey facts about NoneNone is the same as False.None is the same as False.None is the same as False.None is an ... Read More

Everything in Python is an object including classes. All classes are instances of a class called "type".The type object is also an instance of type class. You can inspect the inheritance hierarchy of class by examining the __bases__ attribute of a class object. type() method returns class type of the argument(object) passed as parameter.If single argument type(obj) is passed to type method, it returns the type of given object. If three arguments type(name, bases, dict) is passed, it returns a new type object.Using type()Let’s look at the classes for the most used data types. In the below program we initialize ... Read More

Code objects are a low-level detail of the CPython implementation. Each one represents a chunk of executable code that hasn’t yet been bound into a function. Though code objects represent some piece of executable code, they are not, by themselves, directly callable. To execute a code object, you must use the exec keyword.In the below example we see how the code objects are created for a given piece of code and what are the various attributes associated with hat code object.Example Live Democode_str = """ print("Hello Code Objects") """ # Create the code object code_obj = compile(code_str, '', 'exec') # get ... Read More

If two variables are of the same data types and not iterators like list and dictionary etc, then the expressions a += b is same as a =+b gives the same result. But when n iterator is involved we can not always expect the same. Below is one of such scenario.Case of a = a +bHere we can see when we apply the expression to a list and a string expecting they will get merged, we get back an error.Examplex ='Hello ' z_list = [1, 2, 3] z_list = z_list + x print(z_list)OutputRunning the above code gives us the following ... Read More

As we write python programs we need various other modules to leverage their functions, classes etc. in our current program. We can import those modules at the runtime using the import function. Though you can also import named modules at the beginning of the code, you may need the module temporarily for only few lines of code or you want to make the copy of an object from the module and modify and use it.SyntaxThe syntax of the __import__() function is −__import__(name, globals=None, locals=None, fromlist=(), level=0) Where name - the name of the module you want to import globals and ... Read More

Pygame is a multimedia library for Python for making games and multimedia applications. In this article we will see how to use the pygame module to draws many different shapes on the screen taking into consideration, its height, width and position in the pygame window.In the below program we initialize the pygame moduel and then deifne the colour and dimension for the image. Next we add the different shapes as per the syntax and carefully mention the arguments to the darw functions so that the images do not overlap with each other. The screen.blit function paints the screen while the ... Read More

Pygame is a multimedia library for Python for making games and multimedia applications. In this article we will see how to use the pygame module to get customized font and text on the screen taking into consideration, its height, width, and position in the pygame window.In the below program we initialize the pygame module and then define the mode and the caption for the image. Next we add the font text and define the coordinates for the font. The screen.blit function paints the screen while the while loop keeps listening the end of the game is clicked.Exampleimport pygame import sys ... Read More

Pygame is a multimedia library for Python for making games and multimedia applications. In this article we will see how to use the pygame module to paint a picture on the screen taking into consideration, its height, width and position in the pygame window.In the below program we initialize the pygame module and then define the mode and the caption for the image. Next we load the image and define the coordinates. The screen.blit function paints the screen while the while loop keeps listening the end of the game is clicked.Exampleimport pygame pygame.init() w = 300; h = 300 screen ... Read More

Pandas is one of the most popular python library for data analysis and data wrangling. In this article we will see how we can create a pandas dataframe and then delete some selective rows ort columns from this data frame.Deleting roewsIn the below example we have the iris.csv file which is read into a data frame. We first have a look at the existing data frame and then apply the drop function to the index column by supplying the value we want to drop. As we can see at the bottom of the result set the number of rows has ... Read More