exception handling in complex Python programs
eliben at gmail.com
Wed Aug 20 07:24:45 CEST 2008
""" between file()
and open() in Python 2 and 3, a NameError is thrown with open() in
Python 3 and an IOError is thrown in the other three cases <bashes
head against keyboard>.
This is *exactly* my concern with Python exceptions. You just never
know what can be thrown at you.
> You want to look up Easier to Ask Forgivness than Permission (EAFP)
> which is touted as the "canonical" error-handling paradigm for Python.
Any (semi)complete guides on this canonical paradigm online ? I've
only found some references in maillist discussions.
> def do_something(filename):
> if not os.access(filename,os.R_OK):
> return err(...)
> f = open(filename)
But does os.access cover absolutely all the errors that can happen
during open() ? What guarantees it, and how can I know without you
teaching me, just from the docs ?
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