> For the complete documentation index, see [llms.txt](https://gyansetu-python.gitbook.io/python-programming/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://gyansetu-python.gitbook.io/python-programming/threading.md).

# Threading

```
import time 
import threading
```

### Without Multithreading

```
def calc_square(arr):
    print("calculate square numbers")
    for n in arr:
        time.sleep(1)
        print('square:',n*n)



def calc_cube(arr):
    print("calculate cube of numbers")
    for n in arr:
        time.sleep(1)
        print('cube:',n*n*n)

arr = [2,3,8,9]

t = time.time()

calc_square(arr)
calc_cube(arr)

print("done in : ",time.time()-t)
```

Output:-

```
calculate square numbers
square: 4
square: 9
square: 64
square: 81
calculate cube of numbers
cube: 8
cube: 27
cube: 512
cube: 729
done in :  8.093624591827393
```

### With Multithreading

```
def calc_square(arr):
    print("calculate square numbers")
    for n in arr:
        time.sleep(1)
        print('square:',n*n)

def calc_cube(arr):
    print("calculate cube of numbers")
    for n in arr:
        time.sleep(1)
        print('cube:',n*n*n)

arr = [2,3,8,9]
t = time.time()
t1= threading.Thread(target=calc_square, args=(arr,))
t2= threading.Thread(target=calc_cube, args=(arr,))
t1.start()
t2.start()
t1.join()
t2.join()

print("done in : ",time.time()-t)
```

```
calculate square numberscalculate cube of numbers

square:cube: 8
 4
square:cube: 9
 27
cube: 512
square: 64
square:cube: 81
 729
done in :  4.0517966747283936
```