Counting with Loops

In programming, we often use a counter variable to perform basic arithmetic operations within a loop. This approach allows us to iteratively process data, such as summing values or tracking totals.

For example, if we want to calculate the sum of all numbers in a specific range, we can initialize a counter variable and update it during each iteration.

Let's adapt this concept to our common topic, working with the travel_list. Suppose we want to calculate the total length of all city names in our list.

Note

An f-string in Python is a concise way to format strings. Prefix the string with f and include expressions or variables in curly braces {}. For example, f"Hello, {name}!" inserts the value of name dynamically.


              1234567891011
            
travel_list = ["Monako", "Luxemburg", "Liverpool", "Barcelona", "Munchen"]

# Initialize counter
total_length = 0

# Iteration through the list
for city in travel_list:
    # Add the length of each city name
    total_length += len(city)

print(f"Total length of all city names: {total_length}")

Task

Swipe to start coding

Airports display travel destinations on digital screens, but there’s a character limit of 40 per section. The display updates every 5 countries and scrolls if the total character length exceeds 60 characters.

Iterate through countries in groups of 5 at a time.
Calculate the total character length of each batch.
If a batch's total length exceeds 40 characters, store these 5 countries in overflowing_countries.
Stop once the first overflowing batch is found and print it.

Solution

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Section 1. Chapter 4

Counting with Loops

In programming, we often use a counter variable to perform basic arithmetic operations within a loop. This approach allows us to iteratively process data, such as summing values or tracking totals.

For example, if we want to calculate the sum of all numbers in a specific range, we can initialize a counter variable and update it during each iteration.

Let's adapt this concept to our common topic, working with the travel_list. Suppose we want to calculate the total length of all city names in our list.

Note

An f-string in Python is a concise way to format strings. Prefix the string with f and include expressions or variables in curly braces {}. For example, f"Hello, {name}!" inserts the value of name dynamically.


              1234567891011
            
travel_list = ["Monako", "Luxemburg", "Liverpool", "Barcelona", "Munchen"]

# Initialize counter
total_length = 0

# Iteration through the list
for city in travel_list:
    # Add the length of each city name
    total_length += len(city)

print(f"Total length of all city names: {total_length}")

Task

Swipe to start coding

Iterate through countries in groups of 5 at a time.
Calculate the total character length of each batch.
If a batch's total length exceeds 40 characters, store these 5 countries in overflowing_countries.
Stop once the first overflowing batch is found and print it.

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