Re: is there any overheard with try/except statements?
- From: Roy Smith <roy@xxxxxxxxx>
- Date: Wed, 08 Mar 2006 19:28:54 -0500
In article <EfSdnS4P5s1475LZnZ2dnUVZ_vydnZ2d@xxxxxxx>,
John Salerno <johnjsal@xxxxxxxxxxxxxxx> wrote:
One of the things I learned with C# is that it's always better to handle
any errors that might occur within the codes itself (i.e. using if
statements, etc. to catch potential out of range indexing) rather than
use too many try/catch statements, because there is some overhead every
time the program encounters the try.
Is this the case at all with Python, in terms of extra work or slower
speed? Or is try/except implemented differently in Python than it is in
other languages, so that it runs just like any other code?
Thanks.
Repeat after me: "Python is not <fill in name of your favorite language>"
In C++ (and, I assume, C#), exception handling is relatively expensive, and
is avoided for this reason. It's also avoided (in C++, anyway) because
it's only in the past few (5-10) years that you could pretty much count on
whatever compiler you were using implementing them correctly. Lastly, many
C++/C# programmers came from C, where exceptions don't exist, so they're
not used to using them.
But, that's not Python. In Python, exceptions work as advertised, and
they're cheap. The pythonic way to do things is to embrace the maxim that
"it's easier to ask forgivness than to ask permission". It is usually
cleaner and faster to write a try block than an if statement. For example,
I'll write:
try:
x = foo[y]
except IndexError:
blah
instead of
if y < len (foo):
x = foo[y]
else:
blah
every time.
.
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- From: John Salerno
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