Peng Yu schrieb:
On Thu, Dec 31, 2009 at 11:24 PM, Chris Rebert <c...@rebertia.com> wrote:
On Thu, Dec 31, 2009 at 8:47 PM, Peng Yu <pengyu...@gmail.com> wrote:
I observe that python library primarily use exception for error
handling rather than use error code.
In the article API Design Matters by Michi Henning
Communications of the ACM
Vol. 52 No. 5, Pages 46-56
10.1145/1506409.1506424
http://cacm.acm.org/magazines/2009/5/24646-api-design-matters/fulltext
It says "Another popular design flaw—namely, throwing exceptions for
expected outcomes—also causes inefficiencies because catching and
handling exceptions is almost always slower than testing a return
value."
My observation is contradicted to the above statement by Henning. If
my observation is wrong, please just ignore my question below.
Otherwise, could some python expert explain to me why exception is
widely used for error handling in python? Is it because the efficiency
is not the primary goal of python?
Correct; programmer efficiency is a more important goal for Python instead.
Python is ~60-100x slower than C;[1] if someone is worried by the
inefficiency caused by exceptions, then they're using completely the
wrong language.
Could somebody let me know how the python calls and exceptions are
dispatched? Is there a reference for it?
The source?
http://python.org/ftp/python/2.6.4/Python-2.6.4.tgz
These are really deep internals that - if they really concern you - need
intensive studies, not casual reading of introductionary documents. IMHO
you shouldn't worry, but then, there's a lot things you seem to care I
wouldn't... :)
Diez
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