I'm reading bottle.py source code. It's a web framework, with only 3000+ lines python code. So cool.
I found some code like this:
quiet = False
def __init__(self, host='127.0.0.1', port=8080, **config):
self.options = config
self.host = host
self.port = int(port)
def run(self, handler): # pragma: no cover
# pragma: no cover
It is apparenly related to the coverage.py:
Coverage.py is a tool for measuring code coverage of Python programs. It monitors your program, noting which parts of the code have been executed, then analyzes the source to identify code that could have been executed but was not.
# pragma: no cover is the hint that the part of code should be ignored by the tool -- see Excluding code from coverage .