Built-in scope in Python - Mini Project: Build & Apply

Exploring Built-in Scope in Python

📖 Scenario: Imagine you are learning how Python finds names like functions and variables when you use them. Python first looks in your own code, then in the places it knows by default, called the built-in scope.

🎯 Goal: You will create a simple program to see how Python uses built-in names and how you can use your own names without changing the built-in ones.

📋 What You'll Learn

Create a variable named my_len with a list of three fruits

Create a variable named length and set it to 0

Use a for loop with variable item to count items in my_len

Print the value of length

Print the result of the built-in len function on my_len

💡 Why This Matters

🌍 Real World

Understanding built-in scope helps you avoid mistakes when naming your variables and using Python's built-in functions.

💼 Career

Knowing how Python finds names is important for writing clear and bug-free code, a key skill for any programming job.

1

Create a list named my_len

Create a list called my_len with these exact items: 'apple', 'banana', and 'cherry'.

Python

# Create the list my_len with 'apple', 'banana', and 'cherry'
# Your code here

Need a hint?

Use square brackets [] to create a list and separate items with commas.

2

Create a variable length to count items

Create a variable called length and set it to 0. This will hold the count of items in my_len.

Python

my_len = ['apple', 'banana', 'cherry']
# Create a variable length and set it to 0
# Your code here

Need a hint?

Just write length = 0 to start counting from zero.

3

Count items in my_len using a for loop

Use a for loop with variable item to go through each item in my_len. Inside the loop, add 1 to length for each item.

Python

my_len = ['apple', 'banana', 'cherry']
length = 0
# Use a for loop with item to count items in my_len
# Your code here

Need a hint?

Use for item in my_len: and inside the loop write length += 1 to add one each time.

4

Print the counted length and the built-in length

Print the value of length. Then print the result of the built-in len function called on my_len to compare.

Python

my_len = ['apple', 'banana', 'cherry']
length = 0
for item in my_len:
    length += 1
# Print length
# Print len(my_len)
# Your code here

Need a hint?

Use print(length) and print(len(my_len)) to show both counts.