Add another constructor to the Slide class that takes just a picture filename and plays no sound when it plays.

Note: The second constructor is simple to add, but also requires a check within the “show” method to avoid a Inappropriate argument exception

```
class Slide:
def __init__(self, pictureFile,soundFile):
self.picture = makePicture(pictureFile)
self.sound = makeSound(soundFile)

def __init__(self, pictureFile):
self.picture = makePicture(pictureFile)
self.sound = None

def show(self):
show(self.picture)
if not self.sound==None:
blockingPlay(self.sound)
```