from lesson 03_Data_ Sources_&_Transformations

```
# represent each value as an angle = value / total * 2pi
data['angle'] = data['value']/data['value'].sum() * 2*pi
```

Based on the result, I interpret this as:

- Create a new column.
- Call it ‘angle’.
- Iterate through an implied for loop, creating for each row a cell with the value of its value column as a fraction of the total of all values times pi.
- Color each resulting pie slice according to the color column,

But is this in the same implied for loop, or is this a second iteration?

```
p.wedge(x=0, y=1, radius=0.4,
```

We can infer what a wedge glyph is.

- Is x = the center of the pie?
- Thus making y the outer edge?
- Radius is 0.4
*of what?*