Re: Simple way of handling errors

[TomF]

On 2009-05-07 01:01:57 -0700, Peter Otten <__pete...@web.de> said:
TomF wrote:

As a relative newcomer to Python, I like it a lot but I'm dismayed at
the difficulty of handling simple errors.  In Perl if you want to
anticipate a file-not-found error you can simply do:

open($file)  or die("open($file): $!");

and you get an intelligible error message.  In Python, to get the same
thing it appears you need at least:

try:
f=open(file)
except IOError, err:
print "open(%s): got %s" % (file, err.strerror)
exit(-1)

Is there a simpler interface or idiom for handling such errors?  I
appreciate that Python's exception handling is much more sophisticated
but often I don't need it.

-Tom

While you are making the transition you could write

from perl_idioms import open_or_die

f = open_or_die("does-not-exist")


with the perl_idioms module looking like

import sys

def open_or_die(*args):
    try:
        return open(*args)
    except IOError, e:
        sys.exit(e)

Peter

Thanks.  Rolling my own error module for common errors may be the best 
way to go.

-Tom

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