The else Statement in a while Loop

In Python, the else block can be added to a while loop. The else block executes when the loop terminates normally, meaning the loop condition becomes False without encountering a break statement.

Example: Normal Termination of the Loop

The else block runs when the loop condition becomes False, signifying the loop has completed all iterations.


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travel_list = ["Monako", "Luxemburg", "Liverpool", "Barcelona", "Munchen"]

# Initialize index
i = 0

# Iterate through the destinations
while i < len(travel_list):
    print(travel_list[i])
    i += 1
else:
    print("All destinations have been listed!")

Explanation:

In this example, the while loop iterates through each destination in the travel_list and prints it. Once all destinations are listed, the condition i < len(travel_list) becomes False, triggering the else block, which confirms completion.

Example: Breaking the Loop

If the loop terminates with a break statement (e.g., when a specific city is found), the else block does not execute.


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# List of travel destinations
travel_list = ["Monako", "Luxemburg", "Liverpool", "Barcelona", "Munchen"]

# Initialize index
i = 0

# Search for a specific destination
while i < len(travel_list):
    if travel_list[i] == "Barcelona":
        break
    print(travel_list[i])
    i += 1
else:
    print("All destinations have been listed!")  # This won't execute if break is triggered.

Explanation:

Here, the loop stops as soon as it finds "Barcelona". The else block is skipped because the loop does not terminate normally but is interrupted by the break statement.

Task

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Imagine planning your travel within a fixed budget. This program dynamically calculates and prints the cost of each trip as long as your budget allows. Once the budget is exhausted, the else statement provides a closing message confirming that all affordable trips have been planned.

This program demonstrates how to use the else block with a while loop effectively.

Expected Output:

Solution

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Section 2. Chapter 5

The else Statement in a while Loop

Example: Normal Termination of the Loop

The else block runs when the loop condition becomes False, signifying the loop has completed all iterations.


              1234567891011
            
travel_list = ["Monako", "Luxemburg", "Liverpool", "Barcelona", "Munchen"]

# Initialize index
i = 0

# Iterate through the destinations
while i < len(travel_list):
    print(travel_list[i])
    i += 1
else:
    print("All destinations have been listed!")

Explanation:

Example: Breaking the Loop

If the loop terminates with a break statement (e.g., when a specific city is found), the else block does not execute.


              1234567891011121314
            
# List of travel destinations
travel_list = ["Monako", "Luxemburg", "Liverpool", "Barcelona", "Munchen"]

# Initialize index
i = 0

# Search for a specific destination
while i < len(travel_list):
    if travel_list[i] == "Barcelona":
        break
    print(travel_list[i])
    i += 1
else:
    print("All destinations have been listed!")  # This won't execute if break is triggered.

Explanation:

Here, the loop stops as soon as it finds "Barcelona". The else block is skipped because the loop does not terminate normally but is interrupted by the break statement.

Task

Swipe to show code editor

This program demonstrates how to use the else block with a while loop effectively.

Expected Output:

Solution

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Thanks for your feedback!

Section 2. Chapter 5

Switch to desktop for real-world practiceContinue from where you are using one of the options below