python programming

  ✅ Python – Quick Start Guide for Beginners 🐍💻 Python is a high-level, beginner-friendly programming language. It’s easy to read, versatile, and widely used in web development, data science, AI/ML, automation, and more. 🔹 What You Can Build with Python Automate repetitive tasks Analyze and visualize data Develop web applications Create simple games Work with Artificial Intelligence & Machine Learning 🔹 Python Basics 1. Variables name = "Alex" age = 25 2. Functions def greet ( name ): return "Hello " + name 3. Conditions if age > 18 : print ( "Adult" ) else : print ( "Minor" ) 4. Loops for i in range ( 5 ): print (i) 5. Lists & Dictionaries fruits = [ "Apple" , "Banana" , "Cherry" ] person = { "name" : "Alex" , "age" : 25 } 🔹 Working with Files with open ( "data.txt" , "r" ) as file: ...

  🔁 Top 10 Python Dictionary Methods You Must Know 🧠📘 1. get() – Safely retrieve value by key d.get( 'a' ) # Returns value if key exists, otherwise None 2. keys() – Get all keys d.keys() # Returns dict_keys(['a', 'b']) 3. values() – Get all values d.values() # Returns dict_values([1, 2]) 4. items() – Get key-value pairs d.items() # Returns dict_items([('a', 1), ('b', 2)]) 5. update() – Merge another dictionary d.update({ 'c' : 3 }) # Adds/updates keys: {'a':1, 'b':2, 'c':3} 6. pop() – Remove item by key d.pop( 'a' ) # Returns value and removes key 'a' 7. popitem() – Remove last inserted item d.popitem() # Returns (key, value) of last item 8. setdefault() – Get value or set default d.setdefault( 'x' , 0 ) # Returns value or inserts 'x':0 if missing 9. clear() – Remove all items d.clear() # Results in empty dictionary {} 10. cop...

  ✅ 50 Python Interview Questions & Answers 🐍💼 1. What is Python? Python is a high-level, interpreted, dynamically typed language supporting OOP, procedural, and functional programming . 2. What are Python’s key features? Easy syntax & readability Interpreted & dynamically typed Extensive standard library Cross-platform Large community support 3. Python’s built-in data types? Numeric: int , float , complex Sequence: str , list , tuple Set types: set , frozenset Mapping: dict Boolean & None: bool , NoneType 4. Difference between list, tuple, and set? Type Ordered Mutable Example List Yes Yes [1, 2, 3] Tuple Yes No (1, 2, 3) Set No Yes {1, 2, 3} 5. What are *args and **kwargs ? *args → variable positional arguments **kwargs → variable keyword arguments 6. Lambda function? A one-line anonymous function : square = lambda x: x** 2 7. List comprehension? Concise way to create lists: [x** 2 for x in ra...

  ✅ 10 Python Code Snippets for Interviews & Practice 🐍🧠 1. Factorial using recursion def factorial ( n ): return 1 if n == 0 else n * factorial(n - 1 ) print (factorial( 5 )) # Output: 120 2. Find the second largest number in a list nums = [ 10 , 20 , 30 ] second_largest = sorted ( set (nums))[- 2 ] print (second_largest) # Output: 20 3. Remove punctuation from a string import string s = "Hello, world!" s_clean = s.translate( str .maketrans( '' , '' , string.punctuation)) print (s_clean) # Output: Hello world 4. Find common elements between two lists a = [ 1 , 2 , 3 ] b = [ 2 , 3 , 4 ] common = list ( set (a) & set (b)) print (common) # Output: [2, 3] 5. Convert a list of words into a string words = [ 'Python' , 'is' , 'fun' ] sentence = ' ' .join(words) print (sentence) # Output: Python is fun 6. Reverse words in a sentence s = "Hello World" reversed_s = ' ' .joi...

  ✅ 10 Essential Python Interview Code Snippets 🐍💼 1. Reverse a string s = "hello" print (s[::- 1 ]) # Output: 'olleh' 2. Check if a string is a palindrome def is_palindrome ( s ): return s == s[::- 1 ] print (is_palindrome( "level" )) # Output: True 3. Count word frequency in a list from collections import Counter words = [ 'apple' , 'banana' , 'apple' ] freq = Counter(words) print (freq) # Output: Counter({'apple': 2, 'banana': 1}) 4. Swap two variables a, b = 5 , 10 a, b = b, a print (a, b) # Output: 10 5 5. Fibonacci sequence using recursion def fib ( n ): return n if n <= 1 else fib(n- 1 ) + fib(n- 2 ) print (fib( 6 )) # Output: 8 6. Find duplicate elements in a list lst = [ 1 , 2 , 3 , 2 , 4 ] duplicates = set (x for x in lst if lst.count(x) > 1 ) print (duplicates) # Output: {2} 7. Check if a list is sorted def is_sorted ( lst ): return lst == sort...

  🔁 Top 30 Python List Methods You Should Know 🧠📋 1. append() – Add element to the end lst = [ 1 , 2 ] lst.append( 3 ) # Output: [1, 2, 3] 2. extend() – Add multiple elements from another list lst = [ 1 , 2 ] lst.extend([ 3 , 4 ]) # Output: [1, 2, 3, 4] 3. insert() – Insert element at specific index lst = [ 1 , 3 ] lst.insert( 1 , 2 ) # Output: [1, 2, 3] 4. remove() – Remove first occurrence of a value lst = [ 1 , 2 , 3 ] lst.remove( 2 ) # Output: [1, 3] 5. pop() – Remove element at index (default last) lst = [ 1 , 2 , 3 ] lst.pop( 1 ) # Output: 2, list becomes [1, 3] 6. index() – Find index of first occurrence lst = [ 10 , 20 , 30 ] lst.index( 20 ) # Output: 1 7. count() – Count occurrences of value lst = [ 1 , 1 , 2 ] lst.count( 1 ) # Output: 2 8. sort() – Sort list in ascending order (in-place) lst = [ 3 , 1 , 2 ] lst.sort() # Output: [1, 2, 3] 9. reverse() – Reverse list (in-place) lst = [ 1 , 2 , 3 ] lst.reverse() # Output: [3, 2,...