contextlib_api_error.py

#!/usr/bin/env python


class Context(object):

    def __init__(self, handle_error):
        print '__init__(%s)' % handle_error
        self.handle_error = handle_error

    def __enter__(self):
        print '__enter__()'
        return self

    def __exit__(self, exc_type, exc_val, exc_tb):
        print '__exit__()'
        print ' exc_type =', exc_type
        print ' exc_val  =', exc_val
        print ' exc_tb   =', exc_tb
        return self.handle_error

with Context(True):
    raise RuntimeError('error message handled')

print

with Context(False):
    raise RuntimeError('error message propagated')