In this homework, you will write XPath queries to answer various questions about an XML document. The document is an export of a set of pages from the Petrucci Music Library, an online repository of sheet music that's in the public domain. It's based on the MediaWiki framework, so its contents can be exported into XML.
What's in the application
The directory contains the following files:
readme.md: This document short-data.xml: an export containing just three pages. This is there to help you understand the structure of the XML. It is not exhaustive. long-data.xml: an export containing a much larger number of pages. The unit tests will run your queries against this document practice.py: a simple python script that makes it easy to run a single XPath query against long-data.xml (It could also be easily modified to run against short-data.xml). That should allow you to try your queries as you work. requirements.txt: defines the single dependency needed. Run pip install -r requirements.txt to install the dependency. homework_6.py: contains a single class with method stubs where you should put your queries. You need to replace the "//*" in each of the eight methods with an appropriate XPath query.
query_tool_test.py: contains the unit tests used to grade your implementation of the ComposerPageQueryTool class found in homework_6.py.
Setup
Apart from installing the lxml dependency described in requirements.txt, no additional setup is needed.
Run pip install -r requirements.txt to install. lxml does rely on the libxml2 library however, so there's a chance that you'll need to install that as well. Please refer to its documentation.
Running
As with homework 5, this makes use of the python unittest module. You can run the tests by running python -m unittest query_tool_test.py from the homework-6 directory.
Assignment
There are eight queries that need to be implemented, one for each method. What they should return is specified in the comment string that precedes each method.
Grading
There are eight methods, each of which have a single unit test. Each passed unit test is worth 5 points. Total 40 points
Deliverables
You should upload to Submitty a single file: homework_6.py. It should contain your fully implemented code.
