String in Python [ English ]

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1. Introduction

A string in Python is a sequence of characters enclosed within single quotes (' '), double quotes (" "), or triple quotes (''' ''' or """ """).

Strings are used to represent text data such as names, messages, and sentences.

2. Creating a String

Examples

name = "Python"msg = 'Hello World'text = """This is a multiline string"""

3. Characteristics of Strings

• Ordered (characters have index positions)
• Immutable (cannot be changed after creation)
• Supports indexing and slicing
• Allows duplicate characters

4. Accessing Characters

Indexing

text = "Python" print(text[0])print(text[3])

Output

Ph

Negative Indexing

print(text[-1])

Output

n

5. Slicing

text = "Python" print(text[1:4])

Output

yth

Step in Slicing

print(text[0:6:2])

Output

Pto

6. String Immutability

text = "Python" text[0] = "J" # Error

👉 Strings cannot be modified directly.

7. String Operations

Concatenation (+)

print("Hello " + "World")

Repetition (*)

print("Hi " * 3)

Membership

print("Py" in "Python")

8. Looping Through String

text = "Python" for ch in text: print(ch)

9. Common String Methods

Example

text = "hello" print(text.upper())

10. String Functions

11. Escape Characters

Example

print("Hello\nWorld")

12. String Formatting

Using f-string

name = "Rahul"age = 20 print(f"My name is {name} and I am {age}")

13. Important Points

• Strings are immutable
• Indexed starting from 0
• Can be enclosed in ', ", or """
• Support many built-in methods

14. Summary

• A string is a sequence of characters

• Supports:

  • indexing
  • slicing
  • concatenation

• Cannot be modified after creation

• Provides many useful methods for text processing