Why do python .pyc files contain the absolute path of their source code?

Question

Why do python .pyc files contain the absolute path of their source code, instead of a relative path or something else?

A typical __init__.pyc from Python 2.7 on Ubuntu:

\ufffd\ufffd\ufffdOc@sddlTdS(i\ufffd\ufffd\ufffd\ufffd(t*N(tdbapi2(((s&/usr/lib/python2.7/sqlite3/__init__.py<module>s

Answer 1

To give the information in tracebacks. See for instance http://docs.python.org/library/compileall#cmdoption-compileall-d