DoonopsEdTech
Language

Python Basics · Lesson 1 of 56

Basic

Source: 1-Python Basics/1.0-basic.ipynb

Start here — no coding background needed

What you will learn

Run your first Python lines and see instant output — zero experience needed.

In simple words

A program is a list of instructions. Python reads from top to bottom. `print` simply shows text on screen — like sending a message to yourself.

Think of it like this

Like voice notes to a friend: first note says hello, second says your name.

How to use this lesson

  1. Press Run on the easy example
  2. Change the text inside quotes
  3. Run again and watch output change

Words to know:

  • print() — Shows text on the screen
  • Program — A saved list of instructions for the computer

Start here if you have never coded. We use everyday examples — no jargon without explanation.

Easy example — try this first

Easy example — run this first. Change values and press Run again.

Python

Runs in your browser via Pyodide — no server. First run may take a few seconds.

Reference notes (from full bootcamp)

Optional — deeper detail for when you are ready

Syntax and Semantics in Python

Video Outline:

  • Single line Comments and multiline comments
  • Definition of Syntax and Semantics
  • Basic Syntax Rules in Python
  • Understanding Semantics in Python
  • Common Syntax Errors and How to Avoid Them
  • Practical Code Examples

Syntax refers to the set of rules that defines the combinations of symbols that are considered to be correctly structured programs in a language. In simpler terms, syntax is about the correct arrangement of words and symbols in a code.

Semantics refers to the meaning or the interpretation of the symbols, characters, and commands in a language. It is about what the code is supposed to do when it runs.

Reference example
Python
Output
Expected (from notebook):
Anshul Negi

Runs in your browser via Pyodide — no server. First run may take a few seconds.

Indentation

Indentation in Python is used to define the structure and hierarchy of the code. Unlike many other programming languages that use braces {} to delimit blocks of code, Python uses indentation to determine the grouping of statements. This means that all the statements within a block must be indented at the same level.

Reference example
Python
Output
Expected (from notebook):
32
32

Runs in your browser via Pyodide — no server. First run may take a few seconds.

Reference example
Python
Output
Expected (from notebook):
Hello World

Runs in your browser via Pyodide — no server. First run may take a few seconds.

Reference example
Python
Output
Expected (from notebook):
43

Runs in your browser via Pyodide — no server. First run may take a few seconds.

Reference example
Python
Output
Expected (from notebook):
15

Runs in your browser via Pyodide — no server. First run may take a few seconds.

Reference example
Python

Runs in your browser via Pyodide — no server. First run may take a few seconds.

Reference example
Python
Output
Expected (from notebook):
int

Runs in your browser via Pyodide — no server. First run may take a few seconds.

Reference example
Python
Output
Expected (from notebook):
str

Runs in your browser via Pyodide — no server. First run may take a few seconds.

Reference example
Python
Output
Expected (from notebook):
<class 'int'>
<class 'str'>

Runs in your browser via Pyodide — no server. First run may take a few seconds.

Reference example
Python
Output
Expected (from notebook):
32

Runs in your browser via Pyodide — no server. First run may take a few seconds.

Reference example
Python

Runs in your browser via Pyodide — no server. First run may take a few seconds.

Reference example
Python
Output
Expected (from notebook):
Correct Indentation
This will print
Outside the if block

Runs in your browser via Pyodide — no server. First run may take a few seconds.

Conclusion:

Understanding the syntax and semantics of Python is crucial for writing correct and meaningful programs. Syntax ensures the code is properly structured, while semantics ensures the code behaves as expected. Mastering these concepts will help in writing efficient and error-free Python code.

Practice test — try yourself

Write code, press Check. Wrong answer shows the correct code to copy & run.

Print exactly two lines:
1) Hello, Python!
2) I am learning to code

Hint: Use two print() statements.

Python