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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() FunctionChallenge (del)
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 LoopNested for Loop 2 (del)While Loop inside a for Loop (del)Challenge (del)

book
Using Condition Statements in a while Loop

The if/else structure can be combined with a while loop to add conditional logic for each iteration. This allows you to perform different actions based on specific conditions while the loop executes.

Example: Categorizing Cities by Name Length

Let's apply this concept to our travel_list. The program will categorize cities as having "short" or "long" names depending on their length (less than 8 characters for short, 8 or more for long).


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

# Initialize index
i = 0

# Categorize cities by name length
while i < len(travel_list):
    if len(travel_list[i]) < 8:
        print(travel_list[i], "has a short name.")
    else:
        print(travel_list[i], "has a long name.")
    i += 1
copy

Explanation:

  1. The index i is initialized to 0 to start from the first city;
  2. The while loop runs as long as i is less than the length of the travel_list;
  3. Conditional Logic:
    • if: checks if the length of the current city name is less than 8 characters and prints a message accordingly;
    • else: handles all other cases where the name length is 8 or more characters;
  4. The i variable is incremented at the end of each iteration to move to the next city.
Task
test

Swipe to show code editor

Write a program using a while loop and conditional statements to:

  1. Count the number of cities in the travel_list with names shorter than 8 characters.
  2. Print the total count at the end.

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Section 2. Chapter 3
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book
Using Condition Statements in a while Loop

The if/else structure can be combined with a while loop to add conditional logic for each iteration. This allows you to perform different actions based on specific conditions while the loop executes.

Example: Categorizing Cities by Name Length

Let's apply this concept to our travel_list. The program will categorize cities as having "short" or "long" names depending on their length (less than 8 characters for short, 8 or more for long).


              
123456789101112

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

# Initialize index
i = 0

# Categorize cities by name length
while i < len(travel_list):
    if len(travel_list[i]) < 8:
        print(travel_list[i], "has a short name.")
    else:
        print(travel_list[i], "has a long name.")
    i += 1
copy

Explanation:

  1. The index i is initialized to 0 to start from the first city;
  2. The while loop runs as long as i is less than the length of the travel_list;
  3. Conditional Logic:
    • if: checks if the length of the current city name is less than 8 characters and prints a message accordingly;
    • else: handles all other cases where the name length is 8 or more characters;
  4. The i variable is incremented at the end of each iteration to move to the next city.
Task
test

Swipe to show code editor

Write a program using a while loop and conditional statements to:

  1. Count the number of cities in the travel_list with names shorter than 8 characters.
  2. Print the total count at the end.

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 2. Chapter 3
Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
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