🐍1.14What is a String in Python?

  If you're preparing for an interview, here's a structured and professional answer about Python Strings:

What is a String in Python?

A string in Python is an immutable sequence of characters enclosed within single (' or "), double (" or "), or triple quotes (''' or """). It is a fundamental data type used to represent text.

---

Characteristics of Python Strings:

1. Immutable – Once created, they cannot be modified.
2. Indexed & Slicable – Strings support indexing (s[0]) and slicing (s[1:4]).
3. Dynamic Typing – No need to declare the type explicitly.
4. Unicode Support – Python strings support Unicode characters.

---

Example:

s = "Hello, World!"
print(s[0])     # Output: H
print(s[-1])    # Output: !
print(s[0:5])   # Output: Hello

---

Common String Operations:

Operation	Example	Output
Concatenation	"Hello" + " World"	"Hello World"
Repetition	"Hi" * 3	"HiHiHi"
Length	len("Python")	6
Uppercase	"python".upper()	"PYTHON"
Lowercase	"PYTHON".lower()	"python"
Strip spaces	" hello ".strip()	"hello"
Replace substring	"Hello".replace("H", "J")	"Jello"
Split string	"a,b,c".split(",")	['a', 'b', 'c']

---

Special Types of Strings:

1. Multi-line Strings:

   s = '''This is
   a multi-line
   string.'''
   

2. Raw Strings (ignores escape characters):

   r = r"C:\Users\Documents\file.txt"
   

---

String Formatting Methods:

1. Using format()

   name = "John"
   age = 25
   print("My name is {} and I am {} years old.".format(name, age))
   

2. Using f-strings (Python 3.6+ recommended)

   print(f"My name is {name} and I am {age} years old.")
   

3. Using % formatting (Old method, not recommended)

   print("My name is %s and I am %d years old." % (name, age))
   

---

Key Points to Remember for Interviews:

• Strings are immutable in Python.
• They support indexing, slicing, and various built-in methods.
• Use f-strings for efficient string formatting.
• Python supports Unicode by default.
• Use split(), replace(), strip() for text processing.

Would you like practice questions related to Python strings? 🚀