Global keyword in Python - Mini Project: Build & Apply

Using the Global Keyword in Python

📖 Scenario: Imagine you are creating a simple program to count how many times a button is clicked. The count needs to be updated inside a function but stored outside so it can be used anywhere in the program.

🎯 Goal: You will build a program that uses a global variable to keep track of the count and updates it inside a function using the global keyword.

📋 What You'll Learn

Create a global variable called click_count with initial value 0

Create a function called increment_click that increases click_count by 1

Use the global keyword inside the function to modify the global variable

Print the value of click_count after calling the function twice

💡 Why This Matters

🌍 Real World

Global variables are useful when you want to keep track of information that many parts of your program need to access and update, like scores in a game or settings in an app.

💼 Career

Understanding how to use global variables and the <code>global</code> keyword helps you manage data across different parts of your code, a skill important in many programming jobs.

1

Create the global variable

Create a global variable called click_count and set it to 0.

Python

# Create a global variable called click_count and set it to 0
# Your code here

Need a hint?

Think of click_count as a box outside any function that holds the number 0.

2

Define the function to update the count

Define a function called increment_click that uses the global keyword to access click_count and adds 1 to it.

Python

click_count = 0
# Define the function increment_click that updates click_count
# Your code here

Need a hint?

Inside the function, tell Python you want to use the global click_count by writing global click_count.

3

Call the function twice

Call the function increment_click two times to increase the count.

Python

click_count = 0

def increment_click():
    global click_count
    click_count += 1

# Call increment_click two times
# Your code here

Need a hint?

Just write increment_click() two times, one after the other.

4

Print the final count

Print the value of click_count to show how many times the function was called.

Python

click_count = 0

def increment_click():
    global click_count
    click_count += 1

increment_click()
increment_click()

# Print the value of click_count
# Your code here

Need a hint?

Use print(click_count) to show the number 2 on the screen.