[yt-dev] Issue #972: Can't use attoseconds (yt_analysis/yt)

[John ZuHone]

New issue 972: Can't use attoseconds
https://bitbucket.org/yt_analysis/yt/issue/972/cant-use-attoseconds

John ZuHone:

Not really a big deal, but I noticed today you can't use attoseconds because prefixing "s" with "a" doesn't work:

```python
yt.YTQuantity(1.0,"as")
  File "<string>", line 1
    as
     ^
SyntaxError: invalid syntax
```

Responsible: jzuhone