/usr/share/doc/python-twisted-web/howto/listings/wait_for_it.py is in python-twisted-web 13.2.0-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 | import sys
from twisted.web.template import XMLString, Element, renderer, flatten
from twisted.internet.defer import Deferred
sample = XMLString(
"""
<div xmlns:t="http://twistedmatrix.com/ns/twisted.web.template/0.1">
Before waiting ...
<span t:render="wait"></span>
... after waiting.
</div>
""")
class WaitForIt(Element):
def __init__(self):
Element.__init__(self, loader=sample)
self.deferred = Deferred()
@renderer
def wait(self, request, tag):
return self.deferred.addCallback(
lambda aValue: tag("A value: " + repr(aValue)))
def done(ignore):
print("[[[Deferred fired.]]]")
print('[[[Rendering the template.]]]')
it = WaitForIt()
flatten(None, it, sys.stdout.write).addCallback(done)
print('[[[In progress... now firing the Deferred.]]]')
it.deferred.callback("<value>")
print('[[[All done.]]]')
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