I would like to output a simple table to a PDF file with some conditional formatting of 2- or 3-scale coloring of cells dependent on the value. Like the red-white-green color scaling in Microsoft Excel conditional formatting option.

```
import pandas
import numpy as np
df = pandas.DataFrame(np.random.randn(10, 2), columns=list('ab'))
print df

#Output:
          a         b
0 -1.625192 -0.949186
1 -0.089884  0.825922
2  2.117651 -0.046258
3 -0.921751 -0.144447
4 -0.294095 -1.774725
5 -0.780523 -0.435909
6  0.544958  0.303268
7  0.014335  0.036182
8 -0.756565  0.120711
9  1.145055  0.542755

```

Now, I would like to output this to a PDF in a table with a 3-scale conditional format for column `a` and independently for column `b` so my output would look like the below example from Excel.

Kind of like this, but by column:
![enter image description here](https://i.stack.imgur.com/8EzOd.jpg)