mercurial revisions

[Task Struct From Hell]

I am planning to integrate mercurial on a wiki system written in
python and mainly interested to use it for the revision control of
articles and the inherent diff functionality. Looking through the
manual, one can read:

"In CVS, revision numbers describe the history of individual files. In
Mercurial, RevisionNumbers describe the history of an entire
Repository. Furthermore, in Mercurial, a RevisionNumber is local to a
repository. To uniquely identify a ChangeSet, use a ChangeSetID."

Does mercurial or its API permit us to know  how many (and which)
changesets affect a single file in a repository in an easy way?

Thanks.

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TSFH