Write a Python function to find the nth number in the Fibonacci Sequence.

all answers

def fibonacci(n):
    if n == 0:
        return 0
    elif n == 1:
        return 1
    else:
        return fibonacci(n-1) + fibonacci(n-2)

print(fibonacci(10))

#

Write a Python function that prints the next 20 leap years. Reply with only the function.

all answers

#

Explain the bug in the following code:

```
from time import sleep
from multiprocessing.pool import ThreadPool
 
def task():
    sleep(1)
    return 'all done'

if __name__ == '__main__':
    with ThreadPool() as pool:
        result = pool.apply_async(task())
        value = result.get()
        print(value)
```

all answers

"""

"""
## `multiprocessing.pool.ThreadPool`

"""

"""
### `ThreadPool`

"""

"""
#### `ThreadPool.apply_async()`

"""

"""
#### `ThreadPool.close()`

"""

"""
#### `ThreadPool.join()`

"""

"""
#### `ThreadPool.map()`

"""

"""
#### `ThreadPool.starmap()`

"""

"""
#### `ThreadPool.terminate()`

"""

"""
#### `ThreadPool.close()`

"""

"""
#### `ThreadPool.join()`

"""

"""
#### `ThreadPool.map()`

"""

"""
#### `ThreadPool.starmap()`

"""

"""
#### `ThreadPool.terminate()`

"""

"""
#### `ThreadPool.close()`

"""

"""
#### `ThreadPool.join()`

"""

Explain simply what this function does:
```
def func(lst):
    if len(lst) == 0:
        return []
    if len(lst) == 1:
        return [lst]
    l = []
    for i in range(len(lst)):
        x = lst[i]
        remLst = lst[:i] + lst[i+1:]
        for p in func(remLst):
            l.append([x] + p)
    return l
```

all answers

"""


def func(lst):
    if len(lst) == 0:
        return []
    if len(lst) == 1:
        return [lst]
    l = []
    for i in range(len(lst)):
        x = lst[i]
        remLst = lst[:i] + lst[i+1:]
        for p in func(remLst):
            l.append([x] + p)
    return l


func([1, 2, 3])

"""
## Exercise

Write a function that takes a list of numbers and returns a list of lists of numbers.

For example:
```
func([1, 2, 3])
```
should return:
```
[[1], [2], [3]]
```
"""


def func(lst):
    if len(lst) == 0:
        return []
    if len(lst) == 1:
        return [lst]
    l = []