BackCoding

#BackCoding

A number is even if it is perfectly divisible by 2. When the number is divided by 2, we use the remainder operator % to compute the remainder. If the remainder is not zero, the number is odd.

In this program, we ask the user for the input and check if the number is odd or even. Please note that { } is a replacement field for num

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Python Program to Check if a Number is Odd or Even

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A class is a blueprint for the object.

We can think of class as a sketch of a with labels. It contains all the details about the name, colors, price etc. Based on these descriptions, we can study about the vehicle.

The example for class of Vehicle can be :

class Vehicle:
   ...
  ...
Here, we use the class keyword to define an empty class Vehicle. From class, we construct instances. An instance is a specific object created from a particular class.

Object
An object (instance) is an instantiation of a class. When class is defined, only the description for the object is defined. Therefore, no memory or storage is allocated.


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Creating Class and objects with methods in python

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print various alphabetic pattern in Python. Alphabetical (A-Z) pattern is a series of alphabet which forms a pattern or any shape like triangle, square, rhombus etc. These patterns are created with the help of nested for loop. To create the alphabetic pattern, you should know that how to convert the ASCII value into the ASCII character

chr(): This function is used to convert the ASCII value into the ASCII character

This pattern is similar to the above pattern. The only difference is that, we are storing the value of i in a variable and printing that variable again and again by incrementing it side by side to form the pattern.

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Python program to print alphabetical

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Inheritance is a powerful feature in object oriented programming. It refers to defining a new class with little or no modification to an existing class. The new class is called derived (or child) class and the one from which it inherits is called the base (or parent) class

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Inheritance in Python

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Two strings are said to be anagram if we can form one string by arranging the characters of another string. For example, Race and Care. Here, we can form Race by arranging the characters of Care.

We first convert the strings to lowercase. It is because Python is case sensitive (i.e. R and r are two different characters in Python).

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Python Program to Check If Two Strings are Anagram

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This program removes all punctuations from a string. We will check each character of the string using for loop. If the character is a punctuation, empty string is assigned to it

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Python Program to Remove Punctuations From a String

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ASCII stands for American Standard Code for Information Interchange.

It is a numeric value given to different characters and symbols, for computers to store and manipulate. For example, the ASCII value of the letter 'A' is 65

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Python Program to Find ASCII Value of Character

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Python has a built-in function, calendar to work with date related tasks. You will learn to display the calendar of a given date

import the calendar module. The built-in function month() inside the module takes in the year and the month and displays the calendar for that month of the year.

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Python Program to Display Calendar

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The divmod() method takes two numbers and returns a pair of numbers (a tuple) consisting of their quotient and remainder.

end='\r' overwrites the output for each iteration.

The value of time_sec is decremented at the end of each iteration.

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Python Program to Create a Countdown Timer

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Permutation is the method of selecting elements from a set in different ways.

For example: the number of ways in which characters from yup can be selected are rupesh,pup, yup, ypu, uyp, upy, puy, pyu, and not selecting any.

The if condition prints string passed as argument if it is equal to the length of Rupesh.

In each iteration of the for loop, each character of Rupesh is stored in words.

The elements of words are swapped. In this way, we achieve all different combinations of characters.
This process continues until the maximum length is reached.

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Python Program to Compute all the Permutation of the String

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Let's understand the difference between type() and instance() 
we see that type() cannot distinguish whether an instance of a class is somehow related to the base class. In our case, although obj_triangle is an instance of child class Triangle, it is inherited from the base class Polygon. If you want to relate the object of a child class with the base class, you can achieve this with instance().

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Python Program to Differentiate Between type and isinstance

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Python is an object oriented programming language.

Almost everything in Python is an object, with its properties and methods.

A Class is like an object constructor, or a "blueprint" for creating objects.

Create a Class

To create a class, use the keyword class:

The __init__() Function
The examples above are classes and objects in their simplest form, and are not really useful in real life applications.

To understand the meaning of classes we have to understand the built-in __init__() function.

All classes have a function called __init__(), which is always executed when the class is being initiated.

Use the __init__() function to assign values to object properties, or other operations that are necessary to do when the object is bein created:

The self Parameter
The self parameter is a reference to the current instance of the class, and is used to access variables that belongs to the class.

It does not have to be named self , you can call it whatever you like, but it has to be the first parameter of any function in the class:

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python Class/Object

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A function is a block of code which only runs when it is called.

You can pass data, known as parameters, into a function.

A function can return data as a result.

Arguments
Information can be passed into functions as arguments.

Arguments are specified after the function name, inside the parentheses. You can add as many arguments as you want, just separate them with a comma.

The following example has a function with one argument (fname). When the function is called, we pass along a first name, which is used inside the function to print the full name:

Example
def my_function(fname):
  print(fname + " Refsnes")

Arbitrary Arguments, *args
If you do not know how many arguments that will be passed into your function, add a * before the parameter name in the function definition.

This way the function will receive a tuple of arguments, and can access the items accordingly:

Arbitrary Keyword Arguments, **kwargs
If you do not know how many keyword arguments that will be passed into your function, add two asterisk: ** before the parameter name in the function definition.

This way the function will receive a dictionary of arguments, and can access the items accordingly:
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Python Functions (Division Operetor )

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Create a Python List
A list is created in Python by placing items inside [], separated

Slicing of a Python List
In Python it is possible to access a section of items from the list using the slicing operator :, not just a single item. For example,
my_list[2:5] returns a list with items from index 2 to index 4.
my_list[5:] returns a list with items from index 1 to the end.
my_list[:] returns all list items
Add Elements to a Python List
Python List provides different methods to add items to a list.

1. Using append()

The append() method adds an item at
my_list.append(32)

2.Using remove()
We can also use the remove() method to delete a list ite

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