Macro dz 

macro_rules! dz {
    ($($v:expr),* $(,)?) => { ... };
    ($([$($v:expr),*]),* $(,)?) => { ... };
}

The dz macro can construct a DataFrame from mixed data types.

use charming::datatype::DataFrame;
use charming::dz;

let data: DataFrame = dz![
   [44056, 13334],
   [81.8, 76.9],
   [23968973, 1376048943],
   ["Australia", "China"],
   [2015, 2015]
];