Pychecker warns about Exception example from Python tutorial

[Pekka Niiranen]

Hi there,

why does pychecker v0.8.14 gives this warning:

koe2.py:2: Base class (exceptions.Exc eption) __init__() not called

when run against this example from Python Tutorial:

------------- code starts -------
class MyError(Excepti on):
def __init__(self, value):
self.value = value
def __str__(self):
return repr(self.value )

try:
raise MyError(2*2)
except MyError, e:
print 'My exception occurred, value:', e.value

------------- code starts -------

What does this warning mean and how can I disable it?

-pekka-

[Ville Vainio]

Re: Pychecker warns about Exception example from Python tutorial

>>>>> "Pekka" == Pekka Niiranen <pekka.niiranen @wlanmail.com> writes:

Pekka> Hi there,
Pekka> why does pychecker v0.8.14 gives this warning:

Pekka> koe2.py:2: Base class (exceptions.Exc eption) __init__() not called




Pekka> What does this warning mean and how can I disable it?

You had __init__, and you didn't call the init of the superclass. This
might leave the superclass in uninitialized stage. Your own exception
class is over-engineered, this works the way you want:

--------------------------
In [11]: class MyEx(Exception) : pass
....:

In [12]: raise MyEx("blah")
---------------------------------------------------------------------------
MyEx Traceback (most recent call last)

/home/ville/<console>

MyEx: blah
---------------------------------

--
Ville Vainio http://tinyurl.com/2prnb

[Josiah Carlson]

Re: Pychecker warns about Exception example from Python tutorial


You can fix your pychecker error by adding the non-quoted line below...

[color=blue]
> ------------- code starts -------
> class MyError(Excepti on):
> def __init__(self, value):[/color]
Exception.__ini t__(self)[color=blue]
> self.value = value
> def __str__(self):
> return repr(self.value )
>
> try:
> raise MyError(2*2)
> except MyError, e:
> print 'My exception occurred, value:', e.value[/color]