> For the complete documentation index, see [llms.txt](https://kallyasmedia.gitbook.io/cit-python-cohort-three/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://kallyasmedia.gitbook.io/cit-python-cohort-three/week2/control_flow/for_loop.md).

# For Loops

Use `for` loops to iterate over sequences (lists, tuples, strings) and other iterables.

## Syntax

```python
for item in sequence:
    print(item)
```

## Basic Example

```python
fruits = ["apple", "banana", "cherry"]

for fruit in fruits:
    print(fruit)
```

## Using `range()`

`range()` generates numbers on demand, which is memory-efficient.

```python
for i in range(5):
    print(i)
```

`range(start, stop, step)` is also supported:

```python
print(list(range(2, 10, 2)))  # [2, 4, 6, 8]
```

## Index + Value with `enumerate()`

```python
fruits = ["apple", "banana", "cherry"]

for index, fruit in enumerate(fruits):
    print(index, fruit)
```

## `for` ... `else`

The `else` block runs only if the loop completes without a `break`.

```python
targets = ["Ada", "Grace", "Linus"]
name = "Guido"

for target in targets:
    if target == name:
        print("Found")
        break
else:
    print("Not found")
```

## Common Pitfalls

* Modifying a list while iterating over it.
* Using `range(len(...))` when `enumerate()` is clearer.

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