[julia-users] using a module but with other name, similar to "import numpy as np" in python

[novatena2015]

Hello,

is there an official way to using a module but with different name (not the 
name of the module), like "import numpy as np".

Currently, I can do that with a hack, like the following hack. But I don't 
know if it really prevent method collision or not.

```
module DF
    using DataFrames
end

dv = DF.@data([NA, 3, 2, 5, 4])
mean(DF.dropna(dv))
```