Statement Assesment

One of the first couple questions in the statement assessment asks students to use the str() method without having introduced that in any of the videos up to that point. 

Also maybe add a note for Python3 users that **range** doesn't behave the same way it does in Python2:
```python
#python2
range(0,51)
```
```python
#python3
list(range(0,51))
```