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# Generators

## Generators and `yield`

{% hint style="info" %}
If a function uses the `yield` keyword, it defines an object known as a **generator.**
{% endhint %}

The primary use of a generator is to produce values for use in iteration. Here's an example:

```python
def countdown(n):
    print('Counting down from', n)
    while n > 0:
        yield n
        n -= 1

# Example use
from x in countdown(10):
    print('T-minus', x)
```

## Restartable Generators

## Generator Delegation

## Using Generators in Practice

## Enhanced Generators and `yield` Expressions

## Applications of Enhanced Generators

## Generators and the Bridge to Awaiting