Python 3 has the neat
try:
raise OneException('sorry')
except OneException as e:
# after a failed attempt of mitigation:
raise AnotherException('I give up') from e
syntax which allows raising a followup exception without loosing context. The best analogy I could come up with in Python 2 is
raise AnotherException((e,'I give up')), None, sys.exc_info()[2]
where the (e,'') is an ugly hack to have the original exception's name included in the message. But isn't there a better way?
There's a raise_from in python-future; simply install it
pip install future
and import to use
from future.utils import raise_from
# or: from six import raise_from
class FileDatabase:
def __init__(self, filename):
try:
self.file = open(filename)
except IOError as exc:
raise_from(DatabaseError('failed to open'), exc)
The compatibility package six also supports raise_from, from version 1.9 (released in 2015). It is used in the same manner as above.
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