Using the slightly simplified code (nothing uses the reactor, so do
stuff synchronosuly):
import sys, traceback
from twisted.internet import defer
class MyException(Exception):
pass
def go2():
"An ordinary deferred-returning function that will return a deferred which
is ready to errback()"
try:
raise MyException('xyz')
except Exception:
return defer.fail() # errs back with current exception context
return defer.succeed(1) # unreachable code
@defer.inlineCallbacks
def go_inlinecb():
try:
yield go2()
print 'no exception raised'
except MyException:
print 'got my custom exception'
traceback.print_exc()
except Exception:
print 'got a garden variety exception'
traceback.print_exc()
def go_noinlinecb():
d = go2()
def cb(data):
print 'got data in cb: %s' % (data)
def eb(failure):
try:
failure.raiseException()
except MyException:
print 'got my custom exception'
traceback.print_exc()
except Exception:
print 'got a garden variety exception'
traceback.print_exc()
d.addCallbacks(cb, eb)
if sys.argv[1] == 'inline':
go_inlinecb()
elif sys.argv[1] == 'noinline':
go_noinlinecb()
I get the follwing results:
% python test.py noinline
got my custom exception
Traceback (most recent call last):
File "test.py", line 36, in eb
failure.raiseException()
File "/usr/lib64/python2.7/site-packages/twisted/python/failure.py", line
370, in raiseException
raise self.type, self.value, self.tb
MyException: xyz
% python test.py inline
got my custom exception
Traceback (most recent call last):
File "test.py", line 21, in go_inlinecb
yield go2()
MyException: xyz
This is with
% python --version
Python 2.7.3
% python -c 'import twisted; print twisted.__version__'
12.2.0
Tom
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