Introduction to Python
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📘 Week 10 — Introduction to Python (Part 1)
🖥️ Period 1: Introduction to Python — Syntax & the Print Function
Objective: Students will be introduced to text-based programming using Python. By the end of this lesson, they will understand what Python is, why syntax matters, how to use the
print() function correctly, and how to write comments in their code.
📝 Detailed Teaching Notes
🔹 What is Python?
- Python is one of the most popular and beginner-friendly programming languages in the world.
- It was created by Guido van Rossum and first released in 1991.
- It is used by companies like Google, Netflix, Instagram, NASA, and Spotify.
- Python is known for being readable — its code often looks almost like plain English, which is why it's a great first language.
- Unlike block-based tools (like Scratch), Python is a text-based language — you type actual code, not drag blocks.
🔹 What is Syntax?
Syntax refers to the grammar and rules of a programming language — just like sentences in English need proper punctuation and structure, Python code must follow strict rules.
Python is very strict about syntax. Even a tiny mistake (like a missing colon or bracket) will stop the program and show an error.
Think of it like spelling in English: "I lke pizza" is understandable but technically wrong. Python won't even try to guess what you meant — it will just give you an error.
| ✅ Correct Syntax | ❌ Incorrect Syntax | Error |
|---|---|---|
print("Hello") |
print("Hello") (missing closing parenthesis) |
SyntaxError: unexpected EOF |
if x > 5: |
if x > 5 (missing colon) |
SyntaxError: invalid syntax |
name = "Ali" |
name "Ali" (missing = sign) |
SyntaxError: invalid syntax |
💡 Teacher Tip: Tell students: "The computer is not smart — it's just very obedient. It does exactly what you tell it, not what you mean."
🔹 The print() Function — Your First Tool
print() is a built-in function that displays text (or values) on the screen.
It is almost always the first thing you learn in any programming language — it's how you "talk back" to the user.
Rules for using print():
- Always use parentheses
( )after the word print. - Text (called Strings) must be wrapped in quotation marks — either double
" "or single' '. - You can print multiple items by separating them with commas
,— Python will add a space between them automatically.
| Code | Output |
|---|---|
print("Hello, World!") |
Hello, World! |
print('I love Python') |
I love Python |
print("My name is", "Sara") |
My name is Sara |
print("Age:", 13) |
Age: 13 |
print("Line 1")print("Line 2") |
Line 1 Line 2 |
⚠️ Common Mistake: Students often forget the quotes —
print(Hello) will cause an error because Python thinks Hello is a variable name, not text. Always remind them: text needs quotes!
🔹 Comments — Writing Notes for Yourself (and Others)
- Comments are notes written in the code that the computer completely ignores.
- They start with the
#symbol (called a hash or pound sign). - Everything after
#on that line is ignored by Python. - Comments help you (and other programmers) remember what the code does — especially important as programs get longer.
# This is a comment — Python skips this line completely
print("Hello!") # You can also put a comment after code on the same line
# TODO: Add more features later
# Author: Ahmed — Date: 15/01/2025
💡 Best Practice: Encourage students to comment their code from Day 1 — even simple comments like
# Print greeting build a great habit.
🛠️ Practical Task — Period 1
Tools: Use an online interpreter (e.g., trinket.io/python3, replit.com, or programiz.com) OR a desktop IDE like Thonny (recommended for beginners — it highlights errors in red).
| Task | Description | Expected Output |
|---|---|---|
| Task 1 | Write a program that prints Hello, World! |
Hello, World! |
| Task 2 | Write a program that prints your first name and your favorite food on two separate lines. Use two print() statements. |
My name is Omar My favorite food is Mansaf |
| ⭐ Challenge Task | Write a program that prints a simple "self-portrait" using multiple print statements — e.g., name, age, hobby, favorite color — each on its own line. Add a comment at the top with your name and the date. | Name: Sara Age: 12 Hobby: Drawing Favorite Color: Purple |
🖥️ Period 2: Variables and Simple Arithmetic
Objective: Students will learn how to store data using variables, understand the three main data types (string, integer, float), and perform basic math operations in Python. They will apply this knowledge by building a working temperature converter.
📝 Detailed Teaching Notes
🔹 What is a Variable?
A variable is like a labeled box or container that holds a value.
You give the box a name (the variable name), put something inside it (the value), and later you can open the box to use or change what's inside.
The = sign is called the assignment operator — it does NOT mean "equals" like in math. It means "put this value into this variable."**
score = 0 # Put the number 0 into a box called "score"
player_name = "Ali" # Put the text "Ali" into a box called "player_name"
score = 10 # Now change it — the old value (0) is replaced!
💡 Common Confusion: In math,
x = x + 1 makes no sense. In programming, it means: "Take the current value of x, add 1 to it, and store the result back in x." This is extremely common — students will see it a lot.
🔹 Variable Naming Rules (IMPORTANT!)
| ✅ Valid Names | ❌ Invalid Names | Why? |
|---|---|---|
my_name |
my-name |
No hyphens allowed (Python thinks it's a minus sign) |
age13 |
13age |
Cannot start with a number |
player_score |
player score |
No spaces allowed — use underscores _ instead |
_temp |
class |
Cannot use Python keywords (like class, if, print) |
TotalScore |
total score |
Case-sensitive: TotalScore ≠ totalscore |
💡 Naming Convention (PEP 8 style): Python programmers typically use lowercase with underscores for variable names:
my_age, total_score, user_name. Teach this early — it's a professional habit.
🔹 Data Types — The Three Main Types (for now)
Every value in Python has a type — it tells Python what kind of data it is and what you can do with it.
| Type | Name | Short Code | Example | What It Is |
|---|---|---|---|---|
| String | str | Text in quotes | "Hello", 'Python', "123" |
Any text — letters, numbers, symbols inside quotes |
| Integer | int | Whole numbers | 10, -5, 0, 1000 |
Numbers with NO decimal point |
| Float | float | Decimal numbers | 3.14, -0.5, 99.99 |
Numbers WITH a decimal point |
💡 Key Distinction:
"10" (string) is NOT the same as 10 (integer). One is text, one is a number. You can't do math on "10" — but you can on 10.
name = "Sara" # This is a string (str)
age = 13 # This is an integer (int)
height = 1.55 # This is a float (float)
print(type(name)) # <class 'str'>
print(type(age)) # <class 'int'>
print(type(height)) # <class 'float'>
💡 Teacher Tip: Use the
type() function to let students check what type their variables are — it's a great debugging tool and helps them understand types concretely.
🔹 Arithmetic Operators — Doing Math in Python
| Operator | Name | Example | Result |
|---|---|---|---|
+ |
Addition | 5 + 3 |
8 |
- |
Subtraction | 10 - 4 |
6 |
* |
Multiplication | 6 * 7 |
42 |
/ |
Division | 15 / 4 |
3.75 (always gives a float!) |
// |
Floor Division (bonus) | 15 // 4 |
3 (rounds down) |
% |
Modulus / Remainder (bonus) | 15 % 4 |
3 (leftover after division) |
** |
Exponent / Power | 5 ** 2 |
25 (5 squared) |
⚠️ Important: In Python 3, regular division
/ always returns a float, even if the result is a whole number: 10 / 2 gives 5.0, not 5. Use // if you want an integer result.
🔹 Putting It All Together — Example Program
# Rectangle Area Calculator
# Author: Omar — Date: 15/01/2025
length = 10 # integer
width = 5 # integer
area = length * width # multiplication — result is 50
print("Rectangle Dimensions:")
print("Length:", length)
print("Width:", width)
print("Area:", area)Output:
Rectangle Dimensions:
Length: 10
Width: 5
Area: 50🛠️ Practical Task — Period 2
| Task | Description | Hints |
|---|---|---|
| Task 1 — Basic Variables | Create variables for your name (string), age (integer), and height in meters (float). Print all three on separate lines with labels. | name = "..."age = ...height = ... |
| Task 2 — Simple Calculator | Write a program that stores two numbers in variables, then prints their sum, difference, product, and quotient (division result). | Use 4 print statements or combine with commas |
| ⭐ Task 3 — Temperature Converter | Write a program that converts Celsius to Fahrenheit. Store a Celsius temperature in a variable, apply the formula, and print the result. | Formula: F = (C × 9/5) + 32Try celsius = 20 → should print 68.0Try celsius = 0 → should print 32.0Try celsius = 100 → should print 212.0 |
| ⭐⭐ Bonus Challenge | Make the temperature converter interactive — ask the user to input a Celsius value using input() and then convert it. (Note: input() returns a string, so you'll need float() to convert it — introduce this as a teaser.) |
celsius = float(input("Enter Celsius: ")) |
📋 PYTHON — WEEK 10 CHEAT SHEET
╔══════════════════════════════════════════╗
║ PYTHON — WEEK 10 CHEAT SHEET ║
╠══════════════════════════════════════════%║ print("text") → Display text ║
║ # comment → Ignored by computer ║
║ name = "Ali" → Variable (string) ║
║ age = 13 → Variable (int) ║
║ pi = 3.14 → Variable (float) ║
║ + - * / ** → Math operators ║
║ "text" or 'text' → Both work for strings ║
║ C to F: (C*9/5)+32 ║
╚══════════════════════════════════════════╝
🎯 Learning Outcomes Checklist
By the end of Week 10, students should be able to:
- Explain what Python is and why it's popular
- Understand that syntax matters and identify common syntax errors
- Use
print()correctly with strings, commas, and multiple lines - Write comments using
# - Create and assign variables using
= - Name variables following Python rules (no spaces, no hyphens, no starting with numbers)
- Identify the three data types:
str,int,float - Perform basic arithmetic:
+,-,*,/,** - Write a simple program that stores values and prints results
- Convert Celsius to Fahrenheit using a formula in code
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