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

[Barry Scott]

Michael Foord wrote:
> Barry Scott wrote:
>> I see a lot of E1101 for classes like this:
>>
>> class Foo:
>>     def __init__( self ):
>>        self.some_object = None
>>
>>     def setSome( self, obj ):
>>        self.some_object = obj
>>
>>     def useSome( self ):
>>        self.some_object.someMethod()
>>
>>
>> pylint will complain about the call to someMethod.
>>
>> 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.
>>
>
> Hmmm... my 2 cents worh (maybe less).
>
> It seems like a valid warning. In our code we always do :
>
>     if self.some_object is not None:
>         self.some_object.some_method()
This will not prevent the issuing of a E1101. Its not a warning its an 
error.

pylint is unable to determine what the type that some_object may be. It 
notices
the assignment in setSome but that contains no type info either.

There is a work around that I tried this afternoon.

Adding a function that is never called that does the init does give
pylint the info it needs. For example:

    def __pylint( self ):
       import some
       self.some_object = some.SomeObject()

This only works if the import order of modules allows Foo to import some.

Barry