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Python Loops Tutorial
course content

Course Content

Python Loops Tutorial

Python Loops Tutorial

1. The For Loop
The First for LoopIterating with range() FunctionCounting with LoopsLoop Control StatementsThe Else Statement in a for LoopThe enumerate() Function
2. The while Loop
The First while LoopInfinite LoopUsing Condition Statements in a while LoopLoop Control Statements in a while LoopThe else Statement in a while LoopChoosing Between for and while Loops in Python
3. Nested Loops
Nested for LoopNested while Loopif/else in a Nested Loopbreak/continue in a Nested Loop
4. List and Dictionary Comprehensions
List ComprehensionsList Comprehansions with ConditionsDictionary ComprehensionsDictionary Comprehension with Condition

book
The Else Statement in a for Loop

In Python, the else statement can be used with a for loop. The else block executes when the loop completes all its iterations without being interrupted by a break statement. This feature is particularly useful for confirming that the loop ran to completion.

Let's adapt this concept to the travel_list. We'll print each destination, and when all destinations are processed without interruption, the else block will confirm completion.


              
1234567

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

# Printing all destinations
for city in travel_list:
    print(city)
else:
    print('All destinations have been listed.')
copy

Now, let's add a condition to terminate the loop prematurely using break. If we're looking for a specific city (e.g., 'Barcelona') and find it, the loop stops, and the else block does not execute.


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

# Searching for a specific city
for city in travel_list:
    print(city)
    if city == 'Barcelona':
        break
else:
    print('All destinations have been listed.')
copy

In this case, the else block does not execute because the loop was interrupted with break. You can use not in to confirm that a city is absent from the list. If the city is not found in the list, we can execute specific actions.


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

# Checking if a city is NOT in the list
search_city = 'Paris'

if search_city not in travel_list:
    print(search_city, 'is not in the travel list.')
else:
    print(search_city, 'is in the travel list.')
copy

The not in operator checks whether an element is not present in a collection (like a list, tuple, or string). Use it to check whether a city is not in the favorite_city list.

question mark

What does the else block do in a for loop in Python?

Select the correct answer

Everything was clear?

How can we improve it?

Thanks for your feedback!

SectionΒ 1. ChapterΒ 5

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course content

Course Content

Python Loops Tutorial

Python Loops Tutorial

1. The For Loop
The First for LoopIterating with range() FunctionCounting with LoopsLoop Control StatementsThe Else Statement in a for LoopThe enumerate() Function
2. The while Loop
The First while LoopInfinite LoopUsing Condition Statements in a while LoopLoop Control Statements in a while LoopThe else Statement in a while LoopChoosing Between for and while Loops in Python
3. Nested Loops
Nested for LoopNested while Loopif/else in a Nested Loopbreak/continue in a Nested Loop
4. List and Dictionary Comprehensions
List ComprehensionsList Comprehansions with ConditionsDictionary ComprehensionsDictionary Comprehension with Condition

book
The Else Statement in a for Loop

In Python, the else statement can be used with a for loop. The else block executes when the loop completes all its iterations without being interrupted by a break statement. This feature is particularly useful for confirming that the loop ran to completion.

Let's adapt this concept to the travel_list. We'll print each destination, and when all destinations are processed without interruption, the else block will confirm completion.


              
1234567

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

# Printing all destinations
for city in travel_list:
    print(city)
else:
    print('All destinations have been listed.')
copy

Now, let's add a condition to terminate the loop prematurely using break. If we're looking for a specific city (e.g., 'Barcelona') and find it, the loop stops, and the else block does not execute.


              
123456789

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

# Searching for a specific city
for city in travel_list:
    print(city)
    if city == 'Barcelona':
        break
else:
    print('All destinations have been listed.')
copy

In this case, the else block does not execute because the loop was interrupted with break. You can use not in to confirm that a city is absent from the list. If the city is not found in the list, we can execute specific actions.


              
123456789

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

# Checking if a city is NOT in the list
search_city = 'Paris'

if search_city not in travel_list:
    print(search_city, 'is not in the travel list.')
else:
    print(search_city, 'is in the travel list.')
copy

The not in operator checks whether an element is not present in a collection (like a list, tuple, or string). Use it to check whether a city is not in the favorite_city list.

question mark

What does the else block do in a for loop in Python?

Select the correct answer

Everything was clear?

How can we improve it?

Thanks for your feedback!

SectionΒ 1. ChapterΒ 5
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