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Python Beginner Course (Day 1 - Day 9) 🚀

Welcome to the Python Beginner Course, a structured guide to mastering Python fundamentals in just 9 days! This course covers essential concepts with hands-on examples to help you solidify your Python skills. 🐍✨

📌 Day 1 - Working with Variables in Python

Definition

A variable in Python is a memory location used to store data. Variables can hold different data types, and Python dynamically assigns types based on values.

Use Cases

  • Storing user input
  • Keeping track of scores in games
  • Managing temporary values in calculations

Concepts

  • String, Integer, Float, and Boolean Variables
  • Assigning values using =
  • Printing values using print()
  • Taking user input with input()
  • String concatenation using +
  • Naming conventions: snake_case

Example

name = input("What is your name? ")
print("Hello, " + name + "!")

📌 Day 2 - Understanding Data Types & Type Conversion

Definition

Data types define the kind of values stored in variables.

Use Cases

  • Ensuring correct calculations
  • Converting user input formats

Concepts

  • Basic Data Types: int, float, str, bool
  • Type Checking: type(variable)
  • Type Conversion: int(), str(), float()
  • Mathematical Operations: +, -, *, /, **, //, %

Example

age = int(input("Enter your age: "))
future_age = age + 5
print("In 5 years, you will be " + str(future_age) + " years old.")

📌 Day 3 - Control Flow & Logical Operators

Definition

Control flow determines how a program executes statements based on conditions.

Use Cases

  • Implementing login authentication
  • Game win/loss conditions

Concepts

  • if, elif, else
  • Comparison Operators: ==, !=, >, <, >=, <=
  • Logical Operators: and, or, not
  • Nested Conditions

Example

age = int(input("Enter your age: "))
if age >= 18:
    print("You are an adult.")
elif age > 12:
    print("You are a teenager.")
else:
    print("You are a child.")

📌 Day 4 - Randomisation & Python Lists

Definition

  • Randomisation: Generating unpredictable values using random
  • Lists: Storing multiple items in a structured way

Concepts

  • Creating a list: []
  • Accessing elements: list[0], list[-1]
  • Modifying lists: .append(), .remove(), .pop()
  • Random choices with random.choice()

Example

import random
fruits = ["apple", "banana", "cherry", "date"]
random_fruit = random.choice(fruits)
print("Random fruit: " + random_fruit)

📌 Day 5 - Python Loops

Definition

Loops allow repetitive execution of a code block.

Concepts

  • For Loops: Iterating over lists, strings, and ranges
  • While Loops: Repeating until a condition is False
  • Break & Continue: Exiting or skipping iterations

Example

for i in range(1, 6):
    print("Iteration", i)

number = 1
while number < 5:
    print("Number is", number)
    number += 1

📌 Day 6 - Functions & Karel

Definition

A function is a reusable block of code that performs a task.

Use Cases

  • Reducing redundancy
  • Organizing large programs

Concepts

  • Defining Functions: def function_name():
  • Using Parameters & Return Values
  • Calling Functions to execute code

Example

def greet(name):
    return "Hello, " + name + "!"

print(greet("Alice"))

📌 Day 7 - Hangman Game 🎮

Definition

A classic word-guessing game where players guess letters of a hidden word.

Concepts

  • String Manipulation & Lists
  • User Input Handling
  • Looping Until Condition is Met

Example

word = "python"
guessed_letters = []
attempts = 6

while attempts > 0:
    guess = input("Guess a letter: ").lower()

    if guess in guessed_letters:
        print("You already guessed that letter!")
        continue
    
    guessed_letters.append(guess)

    if guess in word:
        print("Correct guess!")
    else:
        attempts -= 1
        print(f"Wrong guess! You have {attempts} attempts left.")

    if all(char in guessed_letters for char in word):
        print("You guessed the word! It was", word)
        break
else:
    print("You ran out of attempts! The word was", word)

📌 Day 8 - Function Parameters & Caesar Cipher 🔐

Definition

The Caesar Cipher is a simple encryption technique that shifts letters.

Concepts

  • Function Parameters & Return Values
  • String Manipulation using ASCII
  • Modular Arithmetic for Letter Wrapping

Example

def caesar_cipher(text, shift):
    result = ""
    for char in text:
        if char.isalpha():
            base = 'A' if char.isupper() else 'a'
            offset = ord(char) - ord(base)
            shifted = (offset + shift) % 26
            result += chr(ord(base) + shifted)
        else:
            result += char
    return result

encrypted = caesar_cipher("Hello World!", 3)
print(encrypted)  # Khoor Zruog!

📌 Day 9 - Dictionaries, Nesting, & The Secret Auction 🏆

Definition

A dictionary stores data in key-value pairs, useful for structured information.

Concepts

  • Dictionaries: {key: value}
  • Nesting: Storing lists inside dictionaries & vice versa
  • Iterating Through Dictionaries

Example: Secret Auction

bids = {}
bidding_finished = False

while not bidding_finished:
    name = input("Enter your name: ")
    price = int(input("Enter your bid: $"))
    bids[name] = price
    should_continue = input("Are there any other bidders? Type 'yes' or 'no': ").lower()
    if should_continue == 'no':
        bidding_finished = True

highest_bid = max(bids.values())
winner = max(bids, key=bids.get)

print(f"The winner is {winner} with a bid of ${highest_bid}!")

🎯 Conclusion

By completing this 9-day Python beginner course, you’ve learned: ✔️ Variables, data types, and type conversion
✔️ Control flow with if statements
✔️ Loops, functions, and logical operations
✔️ Lists, dictionaries, and nested data structures
✔️ Randomisation, encryption, and simple games

🚀 Keep practicing and happy coding! 🐍💡