On Aug 10, 9:13 am, Kless <[EMAIL PROTECTED]> wrote:
> Which is the best mode for validation of parameters? I'm using the
> next way but it is not well testable.
>
> -----------------------------
> if not self._foo:
> try:
> raise ValueError('ValueError: foo not found')
> except ValueError, err:
> print (err.message)
> print("Valid values: %s\n" % self.valid_foo)
> sys.exit(1)
>
> ...
> ...
> -----------------------------
If you just want the absense of _foo to raise an exception then why to
just reference self._foo and leave the hard work to ptyhon? Something
like:
self._foo
If it is present then fine, if it is not then an exception is raised.
Here it is in the Python shell:
>>> class tmp(object):
def __init__(self):
self._foo
>>> dummy = tmp()
Traceback (most recent call last):
File "<pyshell#4>", line 1, in <module>
dummy = tmp()
File "<pyshell#3>", line 3, in __init__
self._foo
AttributeError: 'tmp' object has no attribute '_foo'
>>>
- Paddy.
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