I don't know whether it's true for all the PEP 340 use cases, but the all the
current examples would read very naturally if the block-template could be
specified in an extended try statement:
1. A template for ensuring that a lock, acquired at the start of a
block, is released when the block is left:
try with_lock(myLock):
# Code here executes with myLock held. The lock is
# guaranteed to be released when the block is left (even
# if by an uncaught exception).
2. A template for opening a file that ensures the file is closed
when the block is left:
try opening("/etc/passwd") as f:
for line in f:
print line.rstrip()
3. A template for committing or rolling back a database
transaction:
try transaction(mydb):
4. A template that tries something up to n times:
try auto_retry(3):
f = urllib.urlopen("http://python.org/peps/pep-0340.html";)
print f.read()
5. It is possible to nest blocks and combine templates:
try with_lock(myLock):
try opening("/etc/passwd") as f:
for line in f:
print line.rstrip()
Michael
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