Python Class Import Error

Question

I'm studying classes and OO in python and I found a problem when I try import a class from a package. The project structure and the classes are described below:

ex1/
    __init__.py
    app/
        __init__.py
        App1.py
    pojo/
        __init__.py
        Fone.py

The classes:

Fone.py

class Fone(object):

    def __init__(self,volume):
        self.change_volume(volume)

    def get_volume(self):
        return self.__volume

    def change_volume(self,volume):
        if volume >100:
            self.__volume = 100
        elif volume <0:
            self.__volume = 0
        else:
            self.__volume = volume

volume = property(get_volume,change_volume)

App1.py

from ex1.pojo import Fone

if __name__ == '__main__':
    fone = Fone(70)
    print fone.volume

    fone.change_volume(110)
    print fone.get_volume()

    fone.change_volume(-12)
    print fone.get_volume()

    fone.volume = -90
    print fone.volume

    fone.change_volume(fone.get_volume() **2)
    print fone.get_volume()

When I try use from ex1.pojo import Fone, the following Error is raised:

fone = Fone(70)
TypeError: 'module' object is not callable

But when I use from ex1.pojo.Fone import *, the program runs fine.

Why I can't import the Fone class with the way I've coded?

dm03514 · Accepted Answer · 2013-05-23 20:54:17Z

5

In python you can import the module or members of that module

when you do:

from ex1.pojo import Fone

you are importning your module Fone so you can use

fone = Fone.Fone(6)

or any other members of that module.

But you can also only import certain members of that module like

from ex1.pojo.Fone import Fone

I think it is worth reviewing some of the documentation on python modules, packages, and imports

edited May 23, 2013 at 20:54

answered May 23, 2013 at 14:43

dm03514

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2 Comments

André Caldas Over a year ago

hmm, strange. I thought that the import of modules was equal to the import of classes in terms of syntax. This confused me because I'm used to construct classes in Java, but Python treats .py files as modules.Because of this, the module name has been capitalized

dm03514 Over a year ago

@AndréCaldas yes in python your module can contain multiple classes, or a multiple functions or a mix

Fatih Erikli · Accepted Answer · 2013-05-23 14:43:30Z

3

You should import class, not module. Example:

from ex1.pojo.Fone import Fone

Also you should lowercase naming convention for your module names.

answered May 23, 2013 at 14:43

Fatih Erikli

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1 Comment

André Caldas Over a year ago

I'm used to construct classes in Java,so I thought the name of the module should come capitalized, like Java. but I enjoyed your tip about convention!

Adi · Accepted Answer · 2013-05-23 15:02:31Z

0

from ex1.pojo.Fone import Fone

edited May 23, 2013 at 15:02

Adi

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answered May 23, 2013 at 14:42

psicopoo

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