Hello dear authors. On the notebook nb_ch06_03.ipynb there are some comments in German. It's not a big deal but if it is possible to correct it it would be good to maintain the standard. Thanks. Also, I think the book is excellent.  
Hello dear authors.
On the notebook nb_ch06_03.ipynb there are some comments in German.
It's not a big deal but if it is possible to correct it it would be good to maintain the standard.
Thanks.
Also, I think the book is excellent.