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Loop Control Statements

When working with loops, the break and continue statements help manage the flow of iteration:

break: exits the loop prematurely when a condition is met;
continue: skips the current iteration and moves to the next one, allowing selective execution;
pass: is a placeholder that does nothing when executed.

Using `break` Keyword

Imagine searching for a specific city in a list. If we want to stop searching as soon as we find the city "Barcelona", we can use the break statement.


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

# Searching for a specific city
for city in travel_list:
    if city == 'Barcelona':
        print('Found Barcelona!')
        break
    else:
        print(city, 'is not Barcelona')

The loop iterates through each city in the travel_list;
When it encounters "Barcelona", the break statement is executed, and the loop stops immediately;
Cities after "Barcelona" (like "Munchen") are not processed.

Using `continue` Keyword

Let's now count the cities in the travel_list that have names shorter than 8 characters while skipping others.


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

short_name_count = 0

for city in travel_list:
    if len(city) >= 8:
        continue  # Skip cities with names 8 or more characters long
    short_name_count += 1

print('Number of cities with names shorter than 8 characters:',  short_name_count)

The loop iterates through each city in the travel_list;
If the length of the city's name is 8 characters or more, the if condition evaluates to True, and the continue statement is executed. This skips the rest of the code for that iteration;
For cities with names shorter than 8 characters, the counter short_name_count is incremented by 1;
After the loop finishes, the final count is printed, showing how many cities have names shorter than 8 characters.

The `pass` Keyword

The pass statement in Python is a placeholder that does nothing when executed. It's often used as a temporary placeholder for code you plan to write later, allowing the program to run without errors. Later, you can replace pass with actual logic.


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travel_list = ['Monaco', 'Luxembourg', 'Liverpool', 'Barcelona', 'Munich']
already_visited = ['Barcelona', 'Monaco']

for city in travel_list:
    if city in already_visited:
        pass
    else:
        print('Going to visit', city)

Task

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You're planning your next adventure and want to prioritize visa-free travel to make the journey smoother. To keep things manageable, you decide to limit your list to only 10 destinations.

Iterate through the countries list. Skip the countries that require a visa.
Add only visa-free countries to travel_list.
Stop adding once travel_list contains 10 countries.

Solution

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Section 1. Chapter 4

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Loop Control Statements

When working with loops, the break and continue statements help manage the flow of iteration:

break: exits the loop prematurely when a condition is met;
continue: skips the current iteration and moves to the next one, allowing selective execution;
pass: is a placeholder that does nothing when executed.

Using `break` Keyword

Imagine searching for a specific city in a list. If we want to stop searching as soon as we find the city "Barcelona", we can use the break statement.


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

# Searching for a specific city
for city in travel_list:
    if city == 'Barcelona':
        print('Found Barcelona!')
        break
    else:
        print(city, 'is not Barcelona')

The loop iterates through each city in the travel_list;
When it encounters "Barcelona", the break statement is executed, and the loop stops immediately;
Cities after "Barcelona" (like "Munchen") are not processed.

Using `continue` Keyword

Let's now count the cities in the travel_list that have names shorter than 8 characters while skipping others.


              12345678910
            
travel_list = ['Monako', 'Luxemburg', 'Liverpool', 'Barcelona', 'Munchen']

short_name_count = 0

for city in travel_list:
    if len(city) >= 8:
        continue  # Skip cities with names 8 or more characters long
    short_name_count += 1

print('Number of cities with names shorter than 8 characters:',  short_name_count)

The loop iterates through each city in the travel_list;
If the length of the city's name is 8 characters or more, the if condition evaluates to True, and the continue statement is executed. This skips the rest of the code for that iteration;
For cities with names shorter than 8 characters, the counter short_name_count is incremented by 1;
After the loop finishes, the final count is printed, showing how many cities have names shorter than 8 characters.

The `pass` Keyword


              12345678
            
travel_list = ['Monaco', 'Luxembourg', 'Liverpool', 'Barcelona', 'Munich']
already_visited = ['Barcelona', 'Monaco']

for city in travel_list:
    if city in already_visited:
        pass
    else:
        print('Going to visit', city)

Task

Swipe to start coding

You're planning your next adventure and want to prioritize visa-free travel to make the journey smoother. To keep things manageable, you decide to limit your list to only 10 destinations.

Iterate through the countries list. Skip the countries that require a visa.
Add only visa-free countries to travel_list.
Stop adding once travel_list contains 10 countries.

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 1. Chapter 4

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

Loop Control Statements

Using break Keyword

Using continue Keyword

The pass Keyword

Solution

Loop Control Statements

Using break Keyword

Using continue Keyword

The pass Keyword

Solution

Using `break` Keyword

Using `continue` Keyword

The `pass` Keyword

Using `break` Keyword

Using `continue` Keyword

The `pass` Keyword