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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() FunctionChallenge: Exploring Steps and Reverse with range()The if/else Statements in a for LoopCounting 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
Dictionary Comprehension with Condition

You can add a condition in a dictionary comprehension to filter items dynamically while creating the dictionary. The syntax for a dictionary comprehension with a condition is:

Example: Filtering Destinations Within a Budget Using a for Loop


              
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travel_wishlist = [
    ["Paris", "France", 2000],
    ["Tokyo", "Japan", 3000],
    ["New York", "USA", 2500],
    ["Kyoto", "Japan", 1500],
    ["Sydney", "Australia", 4000]
]

# Filter destinations within a $2500 budget using a for loop
affordable_destinations = {}

for city, country, budget in travel_wishlist:
    if budget <= 2500:  # Check if the budget is within the limit
        affordable_destinations[city] = budget

print(affordable_destinations)
copy

Description:

This code iterates through the travel_wishlist list, checking if each destination’s budget is less than or equal to $2500. If the condition is met, the city and its budget are added to the affordable_destinations dictionary.

Example: Filtering Destinations Within a Budget Using Dictionary Comprehension


              
123456789101112

            
travel_wishlist = [
    ["Paris", "France", 2000],
    ["Tokyo", "Japan", 3000],
    ["New York", "USA", 2500],
    ["Kyoto", "Japan", 1500],
    ["Sydney", "Australia", 4000]
]

# Use dictionary comprehension to filter destinations
affordable_destinations = {city: budget for city, country, budget in travel_wishlist if budget <= 2500}

print(affordable_destinations)  # Output: {'Paris': 2000, 'New York': 2500, 'Kyoto': 1500}
copy

Description:

This example achieves the same result as the previous one but in a more concise and elegant way. The condition if budget <= 2500 filters the destinations based on the budget, and the resulting dictionary includes only the affordable destinations.

Task
test

Swipe to begin your solution

A traveler wants to create a dictionary of destinations located in Japan. Use dictionary comprehension to filter the travel_wishlist and include only cities where the country is "Japan". The city should be the dictionary key, and the budget should be the value.

Expected Output:

Solution

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Section 4. Chapter 4
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book
Dictionary Comprehension with Condition

You can add a condition in a dictionary comprehension to filter items dynamically while creating the dictionary. The syntax for a dictionary comprehension with a condition is:

Example: Filtering Destinations Within a Budget Using a for Loop


              
12345678910111213141516

            
travel_wishlist = [
    ["Paris", "France", 2000],
    ["Tokyo", "Japan", 3000],
    ["New York", "USA", 2500],
    ["Kyoto", "Japan", 1500],
    ["Sydney", "Australia", 4000]
]

# Filter destinations within a $2500 budget using a for loop
affordable_destinations = {}

for city, country, budget in travel_wishlist:
    if budget <= 2500:  # Check if the budget is within the limit
        affordable_destinations[city] = budget

print(affordable_destinations)
copy

Description:

This code iterates through the travel_wishlist list, checking if each destination’s budget is less than or equal to $2500. If the condition is met, the city and its budget are added to the affordable_destinations dictionary.

Example: Filtering Destinations Within a Budget Using Dictionary Comprehension


              
123456789101112

            
travel_wishlist = [
    ["Paris", "France", 2000],
    ["Tokyo", "Japan", 3000],
    ["New York", "USA", 2500],
    ["Kyoto", "Japan", 1500],
    ["Sydney", "Australia", 4000]
]

# Use dictionary comprehension to filter destinations
affordable_destinations = {city: budget for city, country, budget in travel_wishlist if budget <= 2500}

print(affordable_destinations)  # Output: {'Paris': 2000, 'New York': 2500, 'Kyoto': 1500}
copy

Description:

This example achieves the same result as the previous one but in a more concise and elegant way. The condition if budget <= 2500 filters the destinations based on the budget, and the resulting dictionary includes only the affordable destinations.

Task
test

Swipe to begin your solution

A traveler wants to create a dictionary of destinations located in Japan. Use dictionary comprehension to filter the travel_wishlist and include only cities where the country is "Japan". The city should be the dictionary key, and the budget should be the value.

Expected Output:

Solution

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Everything was clear?

How can we improve it?

Thanks for your feedback!

Section 4. Chapter 4
Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
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