Trace Iterator

trace_iterator.py

class Trace: 
    """A trace iterator
For each run of iteration, this object returns one trace entry
    """
    def __init__(self, filepath):
        self.filepath = filepath 
        self.fd = open(filepath)

    def __enter__(self):
        return self

    def __exit__(self, type, value, traceback):
        self.fd.close()

    def __iter__(self):
        return self

    def next(self):
        raise "You have to override this(Trace::next) method"