Gcse computer science python 5 iteration while and for loops

certainly! in gcse computer science, understanding iteration is a key concept, particularly through the use of `for` and `while` loops in python. these loops allow us to execute a block of code multiple times, which is essential for tasks such as processing lists, counting, or repeating an action until a condition is met.

### 1. **what is iteration?**
iteration refers to the process of repeating a set of instructions or statements a certain number of times or until a specific condition is met. in python, the two primary types of loops are `for` loops and `while` loops.

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### 2. **for loops**

a `for` loop in python is used to iterate over a sequence (like a list, tuple, dictionary, set, or string) or a range of numbers. it is particularly useful when you know in advance how many times you want to execute a block of code.

**syntax:**

**example:**

**output:**

in this example, the loop iterates over each element in the `fruits` list and prints it.

**using `range()`:**
you can also use `for` loops with the `range()` function to repeat actions a specific number of times.

**output:**

### 3. **while loops**

a `while` loop is used to execute a block of code as long as a specified condition is `true`. this type of loop is useful when the number of iterations is not known beforehand.

**syntax:**

**example:**

**output:**

in this example, the loop continues to run as long as `count` is less than 5. each time the loop executes, `count` is incremented by 1.

### 4. **breaking out of loops**

you can exit a loop prematurely using the `break` statement. this is useful for stopping the loop based on a condition.

**example:**

**output:**

### 5. **continue statement**

the `continue` statement skips the current iteration and proceeds to the next iteration of the loop.

**example:**

**output:**

### 6. **nested loops**

you can also nest loops, meaning you can place one loop inside another. this is useful for dealing with multi-dimensional data structures.
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