- Operations on string in Python -

String:

A string is a list of characters. · It can be a combination of alphabets, numbers, punctuation, or can even include space. · In python, anything enclosed between “ “ or ‘ ‘ is considered a string.

In the below given beautiful phrase from “Winnie-the-pooh”

How many times the words ‘than you’ is repeated? 3

How many words are there in this sentence? 18

How many sub sentences are in this phrase? 4

How many words end with ‘er’ in this phrase? 4

This is an example of how we can manipulate a sentence. Now suppose it's an article that spans pages. Will it be easy to manipulate it manually? That’s where string manipulation functions help us.

If ‘str’ is a string variable, · str[0] refers to first character, · str[1] refers to the second character, and so on. · Finally str[len-1] refers to the last character where ‘len’ is the length of the string.

Some other useful and most commonly used string functions are :

Let’s check out how we can analyze the few lines of the book “Charlie and the chocolate factory” by Roald Dahl and print out a report on it.

Print the title of the book “Charlie and the chocolate factory” and then store the few lines of the book in a variable and print it.

Note:

use “ and “”” · For storing multi-lines

use “””. · For storing single line use “ or ‘

Let's see how Python can help us how many characters are there in the story snippet above.

No. of the lines in the paragraph ..Do you think it will be more than 5?

Let’s find out. No. of sentences = No. of ‘. 'Isn’t it?

Print characters in word chocolate in separate lines.

Output:

Program to Check if the word entered by the user is a palindrome. (ie reads the same from both sides .eg: madam)

Print the number of vowels in the story name.

Comments

- Object Oriented Programming -

In OOP, we can represent an entity using a class. A class bundles data (features/properties of entity - color, height, width) and functionality (movement, expression) together. An instance of a class is known as an object. Which is the only cartoon series that had predicted that Trump would be elected as the president of the USA and also predicted the coronavirus spread? Answer: Simpsons. Simpsons is a very popular animated show. You can build something similar with python. But have you ever wondered, how Simpsons look the same in all the series? Only his movement looking and, expression change but his main features like color, height, and face look exactly the same all the time. This is because we create a ‘blueprint’ of Simpsons and whenever we have to simulate him on screen we use this blueprint. This keeps a record of all the features of Simpsons and recreates it whenever we want. This is where Object-Oriented Programming(OOP) h...

-List Slicing in Python-

List Slicing : Slicing helps in creating a new list from an existing list. Syntax list_name [start :end:step] Suppose you have a list of Avengers, arranged in the order of your preference. avengers=[“Iron Man”,”Thor”,”Hulk”,”Spider Man”,”Captain America”,”Black Panther”,”Hawk Eye”,”Vision”,”Black Widow”] Later you decide to split them into a separate list like favourite=[“Iron Man”,”Thor”,”Hulk”] less_favourite =[”Spider Man”,”Captain America”,”Black Panther”] least_favourite=[”Hawk Eye”,”Vision”,”Black Widow”] Now, we have 3 lists formed from the main list. Would you want to create these lists again from the beginning? This is where list slicing helps us. Here is the code to G...

- If structure in Python -

Decision Control Structures: The control structures help in making decisions when a program is being executed. if Statement : Depending on certain conditions, few statements are executed. if-else Statement : D epending on a condition;( if true or false), statements are executed. Elif : It’s a combination of else followed by if. We all have made many decisions in life. (Here, decisions do not mean a big decision.)Most of our decisions depend on different conditions..isn’t it? some situations in which you had to make a decision? ● What to order in a restaurant? ● What to do in my free time? ● Which movie to watch? ● Which subject to take an elective? ● During exams, which question to attempt first? Depending on where you are going, the dress you select to wear will also change ..isn’t it? So let's try an activity. Select the dress, according to a given condition. 1. If going to a party 2. If going out for playing 3. I...

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