Nick Coghlan <[email protected]> added the comment:
1. Any syntax change requires a PEP (and, IMO, any such PEP for this issue
should get rejected: I don't consider this an important enough feature to
deserve dedicated syntax. Others disagree, which is one of the reasons why a
PEP is needed. The other, more important, reason is to ensure the new syntax is
spec'ed out clearly and incorporated into the language reference for the
benefit of other implementations in the event that it *does* get approved)
2. A change that *doesn't* need a PEP is to just adjust the implicit exception
chaining such that __context__ doesn't get set automatically if it has already
been set explicitly (it turns out handling this situation was an open question
in PEP 3134, not a specificied behaviour). That way, this task can be handled
using a utility function:
def no_context(new_exc):
new_exc.__context__ = None
return new_exc
def doXY ():
# ...
try:
page = urlopen( someRequest )
except urllib.error.URLError as e:
raise no_context(MyError( 'while doing XY', e ))
# ...
----------
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