# Python Sched Module

The `sched` module defines a class which implements a general purpose event scheduler.

## Importing the Module

```python
import sched
import time
```

## Creating a Scheduler

To create a scheduler, you instantiate the `scheduler` class. It takes two arguments: a function to return the current time, and a function to delay execution.

```python
s = sched.scheduler(time.time, time.sleep)
```

## Scheduling Events

### `enter()`

Schedule an event to be executed after a delay.

```python
def print_event(name):
    print('EVENT:', time.time(), name)

print('START:', time.time())
s.enter(2, 1, print_event, argument=('first',))
s.enter(3, 1, print_event, argument=('second',))
```

### `enterabs()`

Schedule an event to be executed at a specific time.

```python
# Schedule at a specific time (e.g., current time + 5 seconds)
s.enterabs(time.time() + 5, 1, print_event, argument=('third',))
```

## Running the Scheduler

The `run()` method blocks until all scheduled events have been executed.

```python
s.run()
```

## Canceling Events

Events can be canceled using `cancel()`. `enter()` returns an event object which can be used for cancellation.

```python
e = s.enter(10, 1, print_event, argument=('canceled',))
s.cancel(e)
```

[[programming/python/python]]