How to use bibliograph.parsing?

QuestionBibliographParasing

I'm hoping to do some citation analysis. 
I want to count from a set of Web of Science records:
How many come from a particular institution? How many from that set are from a particular publisher?  
  
I know this is possible if I learn BibTex. 
But that's sounds like a lot of work for really just counting items in a set.  
  
I found a Python module called bibliograph.parsing that sounds promising.  
It takes citations of various formats and returns them in a Python dictionary.  
And I know that there are a lot of Python commands for counting items within dictionaries.  
  
The module is here: https://github.com/collective/bibliograph.parsing  
  
The trouble is that there is no documentation or even an example so I can figure out how to use this module.  
This suggests that it's using some sort of protocol (piping, I guess)   
that is obvious to experienced programmers and invisible to others.     
  
So given that I have a file called citations.txt, citations.bib, or citations.enl, 
what would I type in to return a dictionary of citations using bibliograph.parsing?  

Thanks SOOOO much! Unfortunately, for some reason, the line "source = parser.preprocess(bib)" results in an error message:

source = parser.preprocess(bib)
Traceback (most recent call last):
File "", line 1, in
NameError: name 'parser' is not defined

(Because I'm using Ubuntu on a non-mac, instead of "brew install bibutils" - I used apt-get install bibutils. Not sure if this is a difference that makes a difference)

Oops! I missed copypasting this line:

>>> parser = BibtexParser()

I've added it to my comment above.

apt-get install bibutils should be totally fine.