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October 20, 2015 08:46
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twisted3.py
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from twisted.internet.defer import Deferred, inlineCallbacks, returnValue | |
d0 = Deferred() | |
d1 = Deferred() | |
d2 = Deferred() | |
def check_value(arg, gold): | |
print "check_value", arg, gold | |
assert gold == arg | |
return arg | |
@inlineCallbacks | |
def foo(arg): | |
print 'foo', arg | |
x = yield d1 | |
x = 'foo-' + str(x) | |
print 'foo() is returning', x | |
returnValue(x) | |
def quux(arg): | |
print "quux", arg | |
d = foo('blam') | |
print 'quux() is returning', d | |
return d | |
@inlineCallbacks | |
def bar(arg): | |
print 'bar', arg | |
z = yield quux(arg) | |
print 'bar() is returning', z | |
returnValue(z) | |
d2.callback('d2') | |
if False: | |
d1.callback('d1') | |
else: | |
d1.addCallback(lambda _: 'd1') | |
d0.addCallback(bar) | |
d2.addCallback(check_value, 'd2') | |
d1.addCallback(check_value, 'd1') | |
d0.callback('d0') | |
d2.addCallback(check_value, 'd2') | |
d0.addCallback(check_value, 'foo-d1') | |
# somehow, d1's result has become None here ... | |
d1.addCallback(check_value, 'd1') |
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