Nested for Loop

A nested loop is a loop located within the body of an outer loop. Either the inner or outer loop can take on various forms, including a while loop or a for loop. For instance, the outer for loop can encompass a while loop, and conversely.

Example: Displaying Cities in a Pattern

We will use a nested loop to print each city multiple times in a structured format, resembling a triangle pattern.


              12345678
            
travel_list = ["Monako", "Luxemburg", "Liverpool", "Barcelona", "Munchen"]

# Outer loop for controlling rows
for i in range(1, len(travel_list) + 1):
    # Inner loop for controlling columns
    for j in range(i):
        print(travel_list[j], end=' ')  # Print cities in a row
    print('')  # Move to the next line after each row

Explanation:

Outer Loop: the for loop with range(1, len(travel_list) + 1) determines the number of rows. Each iteration represents a row. i controls how many cities are printed in the current row.
Inner Loop: the for loop with range(i) iterates over the cities to be printed in the current row. j accesses the city names in the travel_list up to the current row index.
Printing: the print(travel_list[j], end=' ') ensures cities are printed on the same row. print('') moves to the next line after each row.

Task

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Imagine you have multiple trips planned, and each trip consists of several destinations. The trips are represented as a list of lists, where each inner list contains the destinations for one trip. Your task is to:

Iterate through each trip (outer list).
Print all destinations in each trip (inner list).
Display the trip number before listing its destinations.

Expected Output:

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Section 3. Chapter 1

Nested for Loop

Example: Displaying Cities in a Pattern

We will use a nested loop to print each city multiple times in a structured format, resembling a triangle pattern.


              12345678
            
travel_list = ["Monako", "Luxemburg", "Liverpool", "Barcelona", "Munchen"]

# Outer loop for controlling rows
for i in range(1, len(travel_list) + 1):
    # Inner loop for controlling columns
    for j in range(i):
        print(travel_list[j], end=' ')  # Print cities in a row
    print('')  # Move to the next line after each row

Explanation:

Outer Loop: the for loop with range(1, len(travel_list) + 1) determines the number of rows. Each iteration represents a row. i controls how many cities are printed in the current row.
Inner Loop: the for loop with range(i) iterates over the cities to be printed in the current row. j accesses the city names in the travel_list up to the current row index.
Printing: the print(travel_list[j], end=' ') ensures cities are printed on the same row. print('') moves to the next line after each row.

Task

Swipe to show code editor

Iterate through each trip (outer list).
Print all destinations in each trip (inner list).
Display the trip number before listing its destinations.

Expected Output:

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 3. Chapter 1

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

Python Loops Tutorial

Nested for Loop

Example: Displaying Cities in a Pattern

Explanation:

Expected Output:

Nested for Loop

Example: Displaying Cities in a Pattern

Explanation:

Expected Output: