[Python-projects] Suggestion about E1101 Instance of 'None' has no 'get' member

[Michael Foord]

Barry Scott wrote:
> Sylvain Thénault wrote:
>   
>>>>> Is there a way to tell pylint that self.some_object is expected to have
>>>>> a certain type? If not is such a feature possible to implement?
>>>>>
>>>>> I'm thinking about annotation like:
>>>>>        self.some_object = None # pylint: variable_type=Some
>>>>>
>>>>> meaning that some_object is expected to be class Some.
>>>>>     
>>>>>         
>>>>>           
>>>> this is certainly feasible at the astng level, the main difficulty being
>>>> that comments are not in the ast and so a preparsing of the module file
>>>> will be necessary (i think). Anyway we'll have to support this kind of
>>>> thing at some point...
>>>>
>>>>   
>>>>       
>>>>         
>>> Indeed. Adding this support will make pylint significantly more useful.
>>>
>>> You already parse the comments to process the pylint: ones. Isn't this 
>>> an extension of
>>> that parsing?
>>>     
>>>       
>> Well yes and no since ideally it should be at the astng level, so other
>> astng based program take advantage of this information as well. Another
>> idea would be to get information from lines such as :
>>
>> assert isinstance(self.attr, aclass)
>>
>> as Adrien suggested to me.
>>   
>>     
> That is a nice idea, especially if you pick up the info from any method 
> of a class
> so that it does not have to be executed at runtime of the code. 
> Something like:
>
> class Foo:
>     def __init__( self ):
>         self.some_object = None
>
>     def useSome( self ):
>         self.some_object.someMethod()
>
>     def __pylint_hint( self ):
>         assert isinstance( self.some_object, some_module.SomeClass )
>
>   
This is how the Wing  IDE does code completion (where it can't divine
the type).

Personally I don't like the idea of adding to production code just to
help PyLint or my IDE, but many people like it.

Fuzzyman
http://www.voidspace.org.uk/index2.shtml

> Barry
>
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> http://lists.logilab.org/mailman/listinfo/python-projects
>
>   




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