def begin_update(self):
        if self.in_update_block:
            raise RuntimeError('Artifact is already open for updates.')
        self.updated = False
        ctx = Context(self)
        ctx.push()
        self.in_update_block = True
        self.clear_dirty_flag()
        return ctx
Open the named log file in append mode.
dataset/ETHPy150Open lektor/lektor/lektor/builder.py/Artifact.begin_update--crossover with--dataset/ETHPy150Open balanced/status.balancedpayments.com/venv/lib/python2.7/site-packages/pip-1.3.1-py2.7.egg/pip/basecommand.py/open_logfile