The First while Loop

The while loop is used to repeat a block of code as long as a specified condition evaluates to True. The condition is checked at the beginning of each iteration, and the loop stops when the condition becomes False.

condition: a Boolean expression that evaluates to True or False.

We will print all destinations from the travel_list one by one.


              123456789
            
travel_list = ["Monako", "Luxemburg", "Liverpool", "Barcelona", "Munchen"]

# Initialize the index
i = 0

# Print each destination using a while loop
while i < len(travel_list):
    print(travel_list[i])
    i += 1

How does the code work?

The variable i starts at 0, which represents the first index of the travel_list;
The while loop checks if i is less than the length of the list (len(travel_list)). This ensures the loop doesn't exceed the list bounds;
The loop prints the destination at the current index travel_list[i];
The variable i is incremented by 1 in each iteration using i += 1;
When i becomes equal to the length of the list, the condition evaluates to False, and the loop stops.

Task

Swipe to show code editor

Write a program using a while loop to:

Print all cities from the travel_list until you encounter the city "Barcelona".
Stop printing as soon as "Barcelona" is found, without printing it.

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 1

The First while Loop

condition: a Boolean expression that evaluates to True or False.

We will print all destinations from the travel_list one by one.


              123456789
            
travel_list = ["Monako", "Luxemburg", "Liverpool", "Barcelona", "Munchen"]

# Initialize the index
i = 0

# Print each destination using a while loop
while i < len(travel_list):
    print(travel_list[i])
    i += 1

How does the code work?

The variable i starts at 0, which represents the first index of the travel_list;
The while loop checks if i is less than the length of the list (len(travel_list)). This ensures the loop doesn't exceed the list bounds;
The loop prints the destination at the current index travel_list[i];
The variable i is incremented by 1 in each iteration using i += 1;
When i becomes equal to the length of the list, the condition evaluates to False, and the loop stops.

Task

Swipe to show code editor

Write a program using a while loop to:

Print all cities from the travel_list until you encounter the city "Barcelona".
Stop printing as soon as "Barcelona" is found, without printing it.

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 1

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

Python Loops Tutorial

The First while Loop

The First while Loop