some source code about twisted

1_7.http_proxy_server/python/twisted-intro-dave/twisted-failure/failure-examples.py

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+# This code illustrates a few aspects of Failures.
+# Generally, Twisted makes Failures for us.
+
+from twisted.python.failure import Failure
+
+class RhymeSchemeViolation(Exception): pass
+
+
+print 'Just making an exception:'
+print
+
+e = RhymeSchemeViolation()
+
+failure = Failure(e)
+
+# Note this failure doesn't include any traceback info
+print failure
+
+print
+print
+
+print 'Catching an exception:'
+print
+
+def analyze_poem(poem):
+    raise RhymeSchemeViolation()
+
+try:
+    analyze_poem("""\
+Roses are red.
+Violets are violet.
+That's why they're called Violets.
+Duh.
+""")
+except:
+    failure = Failure()
+
+
+# This failure saved both the exception and the traceback
+print failure