If you defined this as
```python
def _convert_ascii_to_phred(offset, c)
```
instead, then you could replace the functions below with
```python
_ascii_to_phred33 = partial(_convert_ascii_to_phred, 33)
_ascii_to_phred64 = partial(_convert_ascii_to_phred, 33)
```
Not necessary, but since you showed me ```partial``` recently, I've been finding ways to use it :)