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Learn Counting with Loops | The for Loop
Python Loops Tutorial
course content

Course Content

Python Loops Tutorial

Python Loops Tutorial

1. The for Loop
2. The while Loop
3. Nested Loops
4. List and Dictionary Comprehensions

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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.

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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}")
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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
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book
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}")
copy
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

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 1. Chapter 4
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