Re: python: what's with the underscores?
- From: Tyler Littlefield <tyler@xxxxxxxxxxxxx>
- To: programmingblind@xxxxxxxxxxxxx
- Date: Sun, 27 Dec 2009 19:15:48 -0700
I'm not familiar with this, but I can sort of do some explaining if you need,
too.
On Dec 27, 2009, at 6:49 PM, Alex Hall wrote:
> I was trying to avoid going here since it may not work and will take some
> time, but are you at all interested in a shortish session on Skype? I think
> being able to look at the code and discuss it directly would help a lot. If
> you do not want to, I understand and that is fine, too, but I think it would
> be better than emailing back and forth.
>
>
> Have a great day,
> Alex
> New email address: mehgcap@xxxxxxxxx
> ----- Original Message ----- From: "Haden Pike" <haden.pike@xxxxxxxxx>
> To: <programmingblind@xxxxxxxxxxxxx>
> Sent: Sunday, December 27, 2009 20:44
> Subject: Re: python: what's with the underscores?
>
>
>> On 12/27/2009 8:33 PM, Alex Hall wrote:
>>> Okay then, here is something I have taken from Qwitter's statuses.py file
>>> (src\buffers\facebook). I have tried to insert my questions into it as
>>> comments, and formatting will probably be lost.
>>>
>>> #what happened to the 'self' thing, and why pass it a Facebook object?
>>
>>> The facebook object is defined in src\buffer\facebook\main.py. It is passed
>>> to this class because it can handle what to do with the information it
>>> receives in RetrieveNewPosts.
>>
>>> class statuses(facebook):
>>>
>>> #why no colon here? My error. There should be.
>>> def RetrieveNewPosts(self)
>>> #just an empty list, fine
>>> statuses = []
>>> try:
>>> #doesn't this need some sort of arg, like the UID or the app/user/session
>>> keys? Where are all those? What does the session class do here? How did
>>> Facebook become an object under sessions? The facebook api_key and
>>> secret_key are passed to facebook in src\session\facebook\main.py in the
>>> FinishInitialization function, therefore we don't need them here. The
>>> self.session tells the function to look in the current session for the var
>>> called facebook which already has all the necessary parameters for this
>>> call..
>>> statuses = self.session.Facebook.statuses.get()
>>> except:
>>> logging.exception("Unable to retrieve current statuses.")
>>> return
>>> return statuses
>>> Hope this helps, and if not, shout at me until it does.
>> Haden
>>
>>
>>> Have a great day,
>>> Alex
>>> New email address: mehgcap@xxxxxxxxx
>>> ----- Original Message ----- From: "Haden Pike" <haden.pike@xxxxxxxxx>
>>> To: <programmingblind@xxxxxxxxxxxxx>
>>> Sent: Sunday, December 27, 2009 20:27
>>> Subject: Re: python: what's with the underscores?
>>>
>>>
>>>> That was a mistake, but I'm glad to see that you sort of understood it if
>>>> you caught that. It should be:
>>>>
>>>> def Add(self, x, y):
>>>>
>>>> Haden
>>>>
>>>> On 12/27/2009 6:20 PM, Alex Hall wrote:
>>>>> In the add function, why did you only declare x and y as params, why not
>>>>> self as well?
>>>>>
>>>>>
>>>>> Have a great day,
>>>>> Alex
>>>>> New email address: mehgcap@xxxxxxxxx
>>>>> ----- Original Message ----- From: "Haden Pike" <haden.pike@xxxxxxxxx>
>>>>> To: <programmingblind@xxxxxxxxxxxxx>
>>>>> Sent: Sunday, December 27, 2009 18:16
>>>>> Subject: Re: python: what's with the underscores?
>>>>>
>>>>>
>>>>>> When a function is part of a class, you pass self to it as a parameter.
>>>>>> Example:
>>>>>>
>>>>>> class Myclass():
>>>>>>
>>>>>> def function(self):
>>>>>>
>>>>>> To call variables that can be used throughout the class in any functions
>>>>>> in that class, I would put self before the variable name. Example:
>>>>>>
>>>>>> class Myclass():
>>>>>>
>>>>>> def function(self):
>>>>>> self.var = "Hello world!"
>>>>>>
>>>>>> def AnotherFunction(self):
>>>>>> print("The variable value is: %s." % self.var)
>>>>>>
>>>>>> To call a function from another function, and there both in the same
>>>>>> class, I use self. Example:
>>>>>>
>>>>>> class Myclass():
>>>>>>
>>>>>> def Add(x, y):
>>>>>> return (x+y)
>>>>>>
>>>>>> def TestAddFunction(self):
>>>>>> x = 4
>>>>>> y = 3
>>>>>> print (self.Add(x, y))
>>>>>>
>>>>>> If I want the function to not be a part of the class I would do:
>>>>>>
>>>>>> def function():
>>>>>>
>>>>>> Now to answer your questions about underscores, Edward already answered
>>>>>> part of it. When you create a directory in your python source files,
>>>>>> these are called packages. To let python know that it is a package, you
>>>>>> must put an __init__.py file in that directory. This can be a blank file
>>>>>> or tell python what to automatically import when that package is
>>>>>> imported in another file.
>>>>>>
>>>>>> HTH
>>>>>> Haden
>>>>>>
>>>>>> On 12/27/2009 5:13 PM, Alex Hall wrote:
>>>>>>> Okay, but (A) I did not think Python had constructor methods and (B)
>>>>>>> why do I always see methodName(self): like in your example?
>>>>>>>
>>>>>>>
>>>>>>> Have a great day,
>>>>>>> Alex
>>>>>>> New email address: mehgcap@xxxxxxxxx
>>>>>>> ----- Original Message ----- From: "edward" <personal.edward@xxxxxxxxx>
>>>>>>> To: <programmingblind@xxxxxxxxxxxxx>
>>>>>>> Sent: Sunday, December 27, 2009 17:11
>>>>>>> Subject: RE: python: what's with the underscores?
>>>>>>>
>>>>>>>
>>>>>>>> Two underscores signify either a constructor method or a built in
>>>>>>>> method I
>>>>>>>> think. Like the str method. If you want to define string formatting
>>>>>>>> with
>>>>>>>> your class its defined by two underscores before and after the method
>>>>>>>> name.
>>>>>>>> example __str__(self):
>>>>>>>>
>>>>>>>>
>>>>>>>> -----Original Message-----
>>>>>>>> From: programmingblind-bounce@xxxxxxxxxxxxx
>>>>>>>> [mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Alex Hall
>>>>>>>> Sent: Sunday, December 27, 2009 3:58 PM
>>>>>>>> To: Blind Programming List
>>>>>>>> Subject: python: what's with the underscores?
>>>>>>>>
>>>>>>>> In python, why are some method names surrounded by two underscores?
>>>>>>>> Even
>>>>>>>> some filenames have these two underscores, though I imagine that is
>>>>>>>> more of
>>>>>>>> a convention than anything else. What do the underscores mean, if
>>>>>>>> anything?
>>>>>>>>
>>>>>>>>
>>>>>>>> Have a great day,
>>>>>>>> Alex
>>>>>>>> New email address: mehgcap@xxxxxxxxx
>>>>>>>>
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