Python in 30 Days: A Practical and Theoretical Approach for Beginner.

Day 4: Python Syntax: Basic Concepts — Strings and Lists

Let’s dive into Day 4 of your Python tutorial, focusing on Strings with simple examples.

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Strings in Python

Strings are one of the most commonly used data types in Python. They allow you to store and manipulate text.

Let’s dive into Day 4 of your Python tutorial.

Strings in Python

Strings are one of the most commonly used data types in Python. They allow you to store and manipulate text.

Key String Operations:

• Concatenation: Combine two or more strings.
• Repetition: Repeat a string multiple times.
• Length: Find the number of characters in a string.
• Slicing: Extract part of a string.
• Escape Characters: Used to handle special characters in strings.

Creating a string

# Creating a string
message = "Hello, World!"  
print(message) 
 # Output: Hello, World!

String Concatenation

first_name = "John"
last_name = "Doe"
full_name = first_name + " " + last_name
print(full_name)  
# Output: John Doe

String Repetition- 

We can repeat a string using the * operator.

# String Repetition
greeting = "Hi! " * 3
print(greeting) 
 # Output: Hi! Hi! Hi! 

String Length

Use len() to find the length of a string.

# String Length
length = len(message)
print(length)  
# Output: 13 (The length of "Hello, World!" is 13)

 Slicing a String

We can use slicing to extract part of a string ([start:end]).

Strings are indexed from 0.

# Slicing a String
print(message[0:5])  
# Output: Hello 
(Extracts characters from index 0 to 4)

Escape Characters

# Escape Characters
quote = "He said, \"Hello!\""
print(quote) 
 # Output: He said, "Hello!"

Summary

• Strings are indexed from 0.
• Negative indices access the string from the end (-1 is the last character).
• We can use slicing to extract part of a string ([start:end]).
• We can repeat a string using the * operator.
• Use len() to find the length of a string.

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