When executing the following:

string=git.diff('HEAD~1')

it raises an exception when there are no previous commits. It could be a nice feature to have a kind of query that checks if the wanted commit exists (before executing instructions as reported).

I know it is possible to use a try and exception (and it is what I do in my code at line 99). However, I think it is still a nice feature to have.

I am writing this issue following the suggestion of @Byron in this closed issue.

Besides, if there are suggestions or advice to implement a script (using your API) for analyzing your own git repo and reporting the info in a meaningful way, please do not hesitate to write it down here. I am trying to implement it (for fun) in this little project.