How modules work in Python

Abdul Abdul abdul.sw84 at gmail.com
Mon Nov 17 01:41:51 CET 2014


Dave,

Thanks for your nice explanation. For your answer on one of my questions:

* Modules don't have methods. open is an ordinary function in the module.*

Isn't "method" and "function" used interchangeably? In other words, aren't
they the same thing? Or, Python has some naming conventions here?

Thanks.

On Sun, Nov 16, 2014 at 11:39 PM, Dave Angel <davea at davea.name> wrote:

> Abdul Abdul <abdul.sw84 at gmail.com> Wrote in message:
> > Hello,
> >
> > I'm new to Python, and just have a small question, and thought you might
> have an idea on it.
>
> You should start any new thread with a specification of the
>  versions of software you're asking about.  Since you didn't,
>  I'll assume python version 2.7, PIL version 1.7, and Linux Ubuntu
>   version 14.04.
>
> >
> > I came across the following example that uses the Python Imaging Library
> (PIL):
>
> >
> > from PIL import Image
> > img = Image.open('xyz.jpg')
> >
> > I know that PIL is a module. And, I think that Image is also a module,
> especially we are importing it.
>
> PIL is a package, whuch means it's a module containing other
>  modules.,  and contains modules such as Image. But that syntax
>  "from PIL import Image" doesn't tell you that. Any type of name
>  defined in module PIL can be retrieved by the from
>  syntax.
>
> The way I can tell is either read the docs, or ask in the interpreter.
> from PIL import Image
> print type (Image)
>
> <type 'module'>
>
> That from syntax is roughly equivalent to
> import PIL
> Image = PIL.Image
>
> And the leading capital I would have made me guess it was a class.
>  Thus I checked, using type ()
>
> >
> > I also understood the Image,open() part, as it appears we are using the
> method open() from the Image module.
>
> Modules don't have methods. open is an ordinary function in the module.
>
> >
> > My question is, where did PIL go here?
>
> I don't understand the question.  By using the from syntax, you
>  avoided having PIL in your namespace. If you wanted, you could
>  have said. import PIL.  And used PIL.Image.open()
>
>  Can a module have another module inside it?
> >
> Yes
>
> >
> >
>
>
> --
> DaveA
>
> --
> https://mail.python.org/mailman/listinfo/python-list
>
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