Piece of code -> python -> Time delay - fails

[a-szulc]

Fails because time is not imported

error:

```python
NameError
name 'time' is not defined
```

traceback:

```python
---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
Cell In[2], line 2
      1 # start delay
----> 2 time.sleep(3)

NameError: name 'time' is not defined
```

[pplonski]

Fixed.