Notepad project probem

> I tried to run your code on my PC, it shows this error:

```
Python-projects/notepad/notepadPY.py", line 25, in <module>
    top = Frame(canvas)
NameError: name 'Frame' is not defined
```

> 
> Frame is not defined
> I am learning programming. Can you explain it for me, buddy, Thanks in advance