What is self.file = file for?

[castironpi at gmail.com]

On May 14, 2:26 am, Bruno Desthuilliers <bruno.
42.desthuilli... at websiteburo.invalid> wrote:
> afrobeard a écrit :
>
> (top-post corrected. Please, do not top-post).
>
>
>
>
>
> > On May 14, 3:08 am, wxPytho... at gmail.com wrote:
> >> Hello!
>
> >> I have trouble understanding something in this code snippet:
>
> >> class TextReader:
> >>     """Print and number lines in a text file."""
> >>     def __init__(self, file):
> >>         self.file = file
> >>         .
> >>         .
> >>         .
>
> >> When would you do a thing like  self.file = file  ? I really don't
> >> find an answer on this. Please help me understand this.
>
> > If you are familiar to C++ or a similar language, the concept of the
> > this pointer might not be alien to you. self in this context is
> > basically a reference to the class itself.
>
> Nope. It's a reference to the instance.
>
> > Hence self.file is creating
> > a class member
>
> Nope. It's setting an instance attribute.
>
> > and setting to the input from file.
>
> > As Gary pointed out, during initialization, only the latter parameter
> > i.e. file is being passed to __init__
>
> Nope. Obviously, both parameters are passed - else it just wouldn't
> work. Given an object 'obj' instance of class 'Cls', you can think of
> obj.method(arg) as a convenient shortcut for Cls.method(obj, arg).- Hide quoted text -
>
> - Show quoted text -

I am at the point of open-source, and I agree.