# import threading

**[import threading](https://docs.python.org/3/library/threading.html)** is a Python import that creates and manages threads for concurrent execution. Use threads to run multiple tasks simultaneously in a single process.

## Example

```python
# Python
# description: create and run threads

import threading
import time

def worker(name, delay):
    time.sleep(delay)
    print(f"Worker {name} done")

# Create threads
t1 = threading.Thread(target=worker, args=("A", 1))
t2 = threading.Thread(target=worker, args=("B", 2))

# Start threads (runs concurrently)
t1.start()
t2.start()

# Wait for threads to finish
t1.join()
t2.join()

print("All workers done")

# Thread with return value (using callable)
class Worker:
    def __call__(self, name):
        print(f"Running {name}")

t = threading.Thread(target=Worker(), args=("task",))
t.start()
t.join()
```

## Common classes and methods

- `threading.Thread(target, args)`: create thread
- `thread.start()`: start thread execution
- `thread.join()`: wait for thread to finish
- `thread.is_alive()`: check if thread is running
- `threading.Lock()`: mutual exclusion lock
- `threading.Event()`: event signaling
- `threading.Condition()`: condition variable
- `threading.current_thread()`: get current thread