Hello Colleagues:
>For ticket 1138 (cool movie), when I access the URL:
>http://twistedmatrix.com/projects/core/documentation/howto/tutorial/deferred_tutorial.html
>I get, URL not found. Which deferred tutorial are you referring to?
>>"Deferreds are Beautiful (A Tutorial) at :
>http://twistedmatrix.com/projects/core/documentation/howto/deferredindepth.html.
>I see the reference to python.util there.
Looking at Ticket 1138. Again, I believe the ticket should be referring to the
deferredindepth.html document "Deferreds are Beautiful."
To answer the question: no you do not need python.util. I also put a minor
correction in deferred_ex.py to get rid of the syntax warning in line 57.
Cheers,
Andrew
#!/usr/bin/python
from twisted.internet import defer
from twisted.python import failure
"""
here we have the simplest case, a single callback and a single errback
"""
def handleFailure(f):
print "errback"
print "we got an exception: %s" % (f.getTraceback(),)
f.trap(RuntimeError)
def handleResult(result):
global num
num += 1
print "callback %s" % (num,)
print "\tgot result: %s" % (result,)
return "yay! handleResult was successful!"
def behindTheScenes(result):
# equivalent to d.callback(result)
if not isinstance(result, failure.Failure): # ---- callback
try:
result = handleResult(result)
except:
result = failure.Failure()
else: # ---- errback
pass
if not isinstance(result, failure.Failure): # ---- callback
pass
else: # ---- errback
try:
result = handleFailure(result)
except:
result = failure.Failure()
def deferredExample():
d = defer.Deferred()
d.addCallback(handleResult)
d.addErrback(handleFailure)
d.callback("success")
if __name__ == '__main__':
global num
num = 0
behindTheScenes("success")
print "\n-------------------------------------------------\n"
deferredExample()
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