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How to draw a circle with arc() in HTML5?

I have a website, wherein I publish content related to mathematical expressions. I want to draw a circle in one of the web pages. How can I draw it with HTML5 canvas using the arc() method? Wha.....
Nancy Den
Answered on 22nd Jan, 2018

The arc() method is used to create a circle in HTML5 with the canvas element. For a circle with arc() method, use the start angle as 0 and end angle to 2*Math.PI.Here are the parameter values of the arc() method:S. NoParameterDescription1xx-coordinate2yy-coordinate3rRadius of the circle4startingAngleStarting angle in radians5endingAngleEnding angle in radians6counterclockwise ... Read More

What are the advantages in using a Python class?

What are the advantages in using a Python class?
Rajendra Dharmkar
Answered on 24th Jan, 2018

Classes are a mechanism to organize your code into generic, reusable peices of code. At their best they are reusable code snippets that will be used over and over again with little or no modification. The class concept was inspired by biological collections of features (attributes) and abilities (methods).Functions are ... Read More

How do I correctly clean up a Python object?

How do I correctly clean up a Python object?
Rajendra Dharmkar
Answered on 24th Jan, 2018

Cleanup happens to globals by setting them to None. The locals self destruct at the end of the session. The function __del__ called by Python sets the globals to None.Consider the following code where there is clean up of all objects in the given class:class Counter:     Count = ... Read More

How do you compare Python objects with .NET objects?

 How do you  compare Python objects with .NET objects?
Rajendra Dharmkar
Answered on 24th Jan, 2018

By default, all .NET objects are reference types and their equality and hash code is determined by their memory address. Additionally, assigning a variable to an existing object just makes it point to that address in memory, so there is no costly copying occurring. It appears that this is true ... Read More

How to access Python objects within objects in Python?

I have a program in Python where there is a class P with a variable,w, which is an instance of another class, Q: , If I define y = P(), and f = [y] how can I access objects within objects like .....
Rajendra Dharmkar
Answered on 24th Jan, 2018

The objects within objects can be accessed as followsclass P:  def __init__(self):    self.w = Q() class Q:  def __init__(self):   self.list = [3,4,5]  def function(self):   self.list[2] = 7 y = P() f = [y] print f[0].w.function() print f[0].w.listGives output asNone [3, 4, 7]

How to draw a line with lineTo() in HTML5?

I have a website, wherein I publish learning content. I want to draw a line in one of the web page. How can I draw it with HTML5 canvas using the lineTo() method? What are the values, which can.....
Daniol Thomas
Answered on 22nd Jan, 2018

To draw a line in HTML, use the canvas element. With canvas, use the lineTo() method to draw a line. The lineTo() method includes x and y parameter values, which positions the line.You can try to run the following code to draw a line with lineTo() in HTML5:<!DOCTYPE html> <html> ... Read More

How to draw on the canvas with JavaScript?

I have a website, wherein I publish learning content. I want to draw graphics and figures in it. How to work with HTML5 canvas to draw? How can I draw on the canvas with JavaScript?
Krantik Chavan
Answered on 22nd Jan, 2018

Drawing on the HTML canvas is to be done with JavaScript. Use the HTML DOM Method getElementById() and getContext() before drawing on the canvas.For that, follow some steps:You need to use the getElementById() method to find the canvas element.Use the getContext(), which is drawing object for the canvas. It provides ... Read More

What are Python OOP Basics?

What are Python OOP Basics?
Rajendra Dharmkar
Answered on 24th Jan, 2018

OOP concepts in PythonPython is an object-oriented programming language. We can easily create and use classes and objects in Python.Major object-oriented concepts of Python programming language are given below:Object ; Class;  Method;  Inheritance; Polymorphism ; Data Abstraction ; EncapsulationObjectObject is an entity that has state and behaviour. It may be ... Read More

Why to use canvas tag in HTML5?

I have a website, wherein I publish learning content. I want to draw graphics and figures in it. Will the HTML5 canvas tag work for this purpose. If yes, then how can I create graphics with the.....
Nishtha Thakur
Answered on 22nd Jan, 2018

Specifies height of the canvas.The HTML <canvas> tag is used to draw graphics, animations, etc. using scripting. The <canvas> tag introduced in HTML5.Let’s see a simple <canvas> element with two specific attributes width and height along with all the core HTML5 attributes like id, name, and class etc.<canvas id="myCanvas" width="100" ... Read More

How to convert JSON data into a Python object?

How to convert JSON data into a Python object?
Rajendra Dharmkar
Answered on 24th Jan, 2018

The following code converts a json object(string) into a python object(dictionary). We import the json module and use the json.loads() method to do this.import json json_string = '{"name":"Sonali", "age": 21, "designation":" Software developer"}' print type (json_string) def func(strng):     a =json.loads(strng)     print type(a)     print a ... Read More

How to use step attribute in HTML?

I have a website and some forms in it to collect user input. How can I use the step attribute correctly to set intervals? Do I want to set a range of users, so that they can select the preferre.....
Smita Kapse
Answered on 22nd Jan, 2018

The HTML input type step attribute sets the legal number intervals. Steps are number steps like 0, 4, 8, 12, 16, etc. The step attribute can be used together with the max and min attributes to create a range of legal values.You can try to run the following code to ... Read More

How to use the required attribute in HTML?

I have a website and some forms in it to collect user information. In one of the forms, I am collecting job seekers information. I want to make some of the field’s mandatory for users to .....
Rishi Rathor
Answered on 23rd Jan, 2018

The required attribute in HTML is used o specify that the element should be filled before the form is submitted. If the field isn’t filled and the submit button is clicked, an error generates, which fails form submission. The error will be “Please fill out this field”.The required attribute can ... Read More

How we can convert Python objects into JSON objects?

How we can convert Python objects into JSON objects?
Rajendra Dharmkar
Answered on 24th Jan, 2018

Suppose we have a list object a = [1, 2, 3]. We convert a python object into a JSON object by importing json module and using the method json.dumps() as follows.>>> a = [1, 2, 3] >>> import json >>> json.dumps(a) '[1, 2, 3]'The JSON object we got is '[1, ... Read More

How to use placeholder attribute in HTML?

I have a website and some forms in it to collect user information. In one of the forms, I am collecting job seekers information. How can I set hint in input text field placeholder attribute for.....
Anvi Jain
Answered on 22nd Jan, 2018

If you want to set a hint for text area or input field, then use the HTML placeholder attribute. The hint is the expected value, which gets displayed before the user enters a value, for example, name, details, etc.You can try to run the following code to learn how to ... Read More

Is there any Python object inspector?

Is there any Python object inspector?
Rajendra Dharmkar
Answered on 24th Jan, 2018

There is no single built-in or normal function that acts as a object inspector in Python. There are functions like type(), dir(), vars() or modules like inspect which can be used to find the attributes, properties and methods of any object under inspection.There other functions like id(), getattr(), hasattr(), globals(), ... Read More

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