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}")

Note

The += operator is a shorthand for addition and assignment. It adds the value on the right to the variable on the left and updates the variable. For example, x += 5 is equivalent to x = x + 5.

Task

Swipe to show code editor

Write a Python program to count how many city names in the travel_list have more than 8 characters. Use a counter variable to keep track of the count and iterate through the list.

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 5

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}")

Note

The += operator is a shorthand for addition and assignment. It adds the value on the right to the variable on the left and updates the variable. For example, x += 5 is equivalent to x = x + 5.

Task

Swipe to show code editor

Write a Python program to count how many city names in the travel_list have more than 8 characters. Use a counter variable to keep track of the count and iterate through the list.

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 5

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

Python Loops Tutorial

Counting with Loops

Counting with Loops