Python Courses: Basic for Backend

This repository contains my Python practice lessons.
Each folder represents a separate lecture with examples and exercises.

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Lessons Overview

Lesson 1: Introduction

• Topic: Typing, Variables, Strings, Numbers, Boolean Algebra, Branching
• Folder: 1. Introduction. Typing. Variables. Strings and Numbers. Boolean Algebra. Branching
• File: lection_1_python_2025.py
• Description: Basics of Python, variables, strings, numbers, boolean logic, and conditional branching.

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Lesson 2: Exception Handling, Lists, Strings, Slices, Loops

• Topic: Exception Handling, Lists, Strings in Detail, Slices, Loops
• Folder: 2. Exception Handling. Lists, Strings in Detail, Slices, Loops
• Files:
  • lection_2_python_2025.py
  • practice.py
• Description: Learn how to handle errors with try/except, work with lists and strings, understand slicing, and use loops in depth.

🧠 Practice Tasks

1. Create a list numbers with numbers from 1 to 10.

   • Print each number squared.
   • Find the sum of all numbers.

2. Create a string text and print each character in a loop.

3. Use slices to print the first 5 and last 5 characters of text.

4. Print numbers from 1 to 20 divisible by 3.

5. Find the sum of numbers from 1 to 100 using a while loop.

6. Create an infinite loop asking the user for a number and print its square.

   • Exit when the user enters 0 or exit.

7. Print unique words from a list with duplicates.

8. Ask the user for text and count vowels (a, e, i, o, u).

9. Replace all occurrences of a word in a sentence with "replaced".

10. Remove duplicates from a list without using sets.

11. Find the smallest and largest number in a list without using built-in functions.

12. Implement the FizzBuzz task:

    • Print numbers from 1 to n.
    • Replace multiples of 3 with "Fizz", 5 with "Buzz", and both with "FizzBuzz".

12.1 Make FizzBuzz dynamic — ask the user for both divisors and n.

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How to Run a Lesson

1. Open a terminal in the desired lesson folder.
2. Run the Python file, for example:

   python lection_2_python_2025.py