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PyCon: Evangelizing PythonPyCon: Evangelizing PythonPosted Apr 2, 2013 16:15 UTC (Tue) by lab (subscriber, #51153)In reply to: PyCon: Evangelizing Python by kleptog Parent article: PyCon: Evangelizing Python
> Python is the only contemporary language I know that includes something like the with-statement, which does say something
The C# 'using' statement?
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PyCon: Evangelizing Python Posted Apr 2, 2013 17:06 UTC (Tue) by hummassa (subscriber, #307) [Link]
Every single C++ variable initialization is the equivalent to python's with and C#'s using...
PyCon: Evangelizing Python Posted Apr 2, 2013 17:23 UTC (Tue) by intgr (subscriber, #39733) [Link]
Similar, yes. Equivalent, no.
1. Python's "with" statement is more flexible, it has access to the exception when it occurs. A "with db_transaction():" block can automatically decide to commit or roll back, unlike C++/C#. You can also implement something like "with ignore_exception(OSError):"
2. Python doesn't require you to create a local variable to hold the state; this always annoys me when using the RAII pattern to hold locks in C++.
3. Prettier syntax ;)
PyCon: Evangelizing Python Posted Apr 2, 2013 19:13 UTC (Tue) by hummassa (subscriber, #307) [Link] 1. std::uncaught_exception() allows for your commit/rollback scenario, but not your ignore_this_exception scenario. The latter does not seem a good idea to me, but...2. the lock thing can be implicit... it's a matter of how you do it. Anyway,
{
some_lock_t lock(x);
x.do_something();
}
does not seem sooo wrong to me... although I usually put it on X and dox.do_something_locked<some_lock_t>();only, or even some_locking_scaffold(x).do_something();and this last one is really easy. 3. it's not! :-D
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