Summary  
This chapter explains how to choose between for loops for a predetermined number of iterations or iterating over sequences and while loops for condition-based or indefinite repetition.  

General domain of usage  
Iterative data processing

Loops are essential tools for repetitive tasks in Python, but deciding whether to use a `for` loop or a `while` loop depends on the nature of the task. Both have unique strengths that suit different scenarios.

A `for` loop is ideal when you know the exact number of iterations or are iterating through a sequence like a list, tuple, string, or range.

#### Iterating Over Sequences

When you need to process each element in a list, tuple, or string.

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

for city in travel_list:
    print(city)

#### Fixed Number of Iterations

When the number of iterations is predetermined.

for i in range(5):
    print('Trip', i + 1)

### When to Use `while` Loops

A `while` loop is better suited for situations where the number of iterations is unknown in advance, and the loop depends on a condition.


#### Condition-Based Iteration

When you want the loop to continue until a specific condition is met.

budget = 1000
travel_costs = [300, 150, 200, 400, 100]
total_cost = 0
i = 0

while total_cost + travel_costs[i] <= budget:
    total_cost += travel_costs[i]
    print('Trip', i + 1, 'cost:', travel_costs[i])
    i += 1

#### Infinite Loops with Exit Conditions

When you need an ongoing process that stops based on a condition.

``` python
while True:
    city = input("Enter a city (or 'stop' to end): ")
    if city == "stop":
        break
    print(f"City added: {city}")
```

Modify the code to stop the loop prematurely when a single trip exceeds $400. Where should you add the `break` statement?

Build confidence in mastering Python loops! Start with the basics of for and while loops and progress to advanced concepts like nested loops, control statements, and dynamic conditions. With hands-on practice and real-world examples, gain the skills to write efficient, clean, and powerful code. Perfect for beginners and anyone looking to sharpen their Python expertise!

Master how to iterate through sequences with for loop, use range() effectively, explore conditions with if/else, and control loops with break and continue. Get ready to write efficient, clean, and practical code as you tackle fun challenges!

Choosing Between for and while Loops in Python

Iterating Over Sequences

Fixed Number of Iterations

When to Use `while` Loops

Condition-Based Iteration

Infinite Loops with Exit Conditions

Choosing Between for and while Loops in Python

Iterating Over Sequences

Fixed Number of Iterations

When to Use `while` Loops

Condition-Based Iteration

Infinite Loops with Exit Conditions

Choosing Between for and while Loops in Python

Iterating Over Sequences

Fixed Number of Iterations

When to Use while Loops

Condition-Based Iteration

Infinite Loops with Exit Conditions

Choosing Between for and while Loops in Python

Iterating Over Sequences

Fixed Number of Iterations

When to Use while Loops

Condition-Based Iteration

Infinite Loops with Exit Conditions

When to Use `while` Loops

When to Use `while` Loops