Server Side Programming Articles - Page 2618 of 2646

The basic way to do output to screen is to use the print statement.>>> print 'Hello, world' Hello, worldTo print multiple things on the same line separated by spaces, use commas between them. For example:>>> print 'Hello, ', 'World' Hello, WorldWhile neither string contained a space, a space was added by the print statement because of the comma between the two objects. Arbitrary data types can also be printed using the same print statement, For example:>>> import os >>> print 1, 0xff, 0777, (1+5j), -0.999, map, sys 1 255 511 (1+5j) -0.999 Objects can be printed on the same line ... Read More

Currently you cannot add namespaces to XML documents directly as it is not yet supported in the in built Python xml package. So you will need to add namespace as a normal attribute to the tag. For example,import xml.dom.minidom doc = xml.dom.minidom.Document() element = doc.createElementNS('http://hello.world/ns', 'ex:el') element.setAttribute("xmlns:ex", "http://hello.world/ns") doc.appendChild(element) print(doc.toprettyxml())This will give you the document,

Python allows you to save definitions to a file and then use them in a script or interactive instance of the interpreter. A module is a file that contains definitions that can be imported into other modules or the main module. So, a Python module is nothing more than a package that contains reusable code. Modules are stored in a folder that contains a __init .py file. Modules can contain both functions and classes. The import keyword is used to import modules. A file containing Python commands and definitions is referred to as a module. These files named .py ... Read More

Namespaces help in organizing code, managing the scope of variables and preventing naming conflicts. Python and C++ use namespaces, but they do so in different ways. Below is an overview of namespaces in both. Namespaces in C++ In C++, namespaces are created using the keyword 'namespace'. They are mainly intended to organize code into logical groups and avoid name conflicts, particularly when working with multiple libraries. Example In the following example we are going to how to use a namespace by utilizing '::' to access functions within that namespace. #include using namespace std; // first namespace namespace first_space ... Read More

Globals in Python are global to a module, not across all modules. (Unlike C, where a global is the same across all implementation files unless you explicitly make it static.). If you need truly global variables from imported modules, you can set those at an attribute of the module where you're importing it.import module1 module1.a=3On the other hand, if a is shared by a whole lot of modules, put it somewhere else, and have everyone import it:global_module.py module1.py: import global_module def fun():     print global_module.var Other files: import global_module import module1 global_module.var = 3 module1.fun()Read More

What are Namespace Packages? Namespace packages are a special type of package that were introduced in Python 3.3. These allow you to split package contents across multiple directories. If you didn't include at least an empty _init_.py file in your package, then your package becomes a namespace package. Python supports three main types of namespace packages - Implicit namespace packages pkg_resources-style pkgutil-style Python Packages and Imports Python package is a directory containing a _init_.py file and one or more Python modules. When you import from a package, ... Read More

What are Namespace Packages? Namespace packages are a type of package in Python that allows you to split the sub-packages and modules within a single package across multiple, separate distribution packages. Unlike normal packages, the namespace packages don't require _init_.py file. Automatically importing all submodules within a namespace package serves several purposes, like auto-registration without manually importing, and to load all available plugins in a system. This article discusses the two methods that you can use to import all the sub-modules of a Python namespace package - Using pkgutil.iter_modules() Using ... Read More

Namespace packages is a special package introduced in Python 3.3 that allows you to split package contents across multiple directories. If you didn't include at least an empty _init_.py file in your package, then your package becomes a namespace package. In Python, a namespace package allows you to spread Python code among several projects. This is useful when you want to release related libraries as separate downloads. Currently, there are three methods for developing namespace packages. These methods are mentioned below. Native namespace packages (PEP 420) pkgutil-style Namespace packages ... Read More

Yes, a function call (any function call, not just recursive ones) creates a new namespace. BUT, when given as parameters, OBJECTS are passed by reference.So, the new namespace get its own copy of this reference but it still refers to the same object as in the calling function, and if you change the content of that object, you will notice the change in the calling function.To be more specific, Whenever the Interpreter encounters a call to a function, its creates a frame object, which is pushed to a frame stack. Each time a frame is created, that frame is given ... Read More

Namespace is a way to implement scope. In Python, each package, module, class, function and method function owns a "namespace" in which variable names are resolved. When a function,  module or package is evaluated (that is, starts execution), a namespace is created. Think of it as an "evaluation context". When a function, etc., finishes execution, the namespace is dropped. The variables are dropped. Plus there's a global namespace that's used if the name isn't in the local namespace.Each variable name is checked in the local namespace (the body of the function, the module, etc.), and then checked in the global ... Read More