# Escape characters for LaTeX

I am using SageTeX and LaTeX to produce several variations of an exam, with a script that makes several iterations. I do this:

```
var('x, y, z')
v = vector([x, y, z])
a = vector([1, -2, -1])
```

These will change from one iteration to the next.

```
sortie = str(latex(a.dot_product(v)))
```

This leads to

```
x - 2 \\, y - z
```

which is correct, and I would like to turn into

```
\bbm{x} -2 \\, \bbm{y} - \bbm{z}
```

for the LaTeX processing so that `x`

, `y`

and `z`

are shown like vectors.

Suggestions?