Loading classes with inheritance from package

Question

Following structure:

app.py
  /package
    __init__.py
    foo.py
    bar.py

"foo.py" and "bar.py" contains both classes "Foo" and "Bar". Class "Foo" inherits from class "Bar". We have following code in the files...

"app.py":

from package import Foo

print Foo()

"__init__.py":

from foo import Foo
from bar import Bar

"foo.py":

class Foo(Bar):
    pass

"bar.py":

class Bar:
    pass

If I create an instance from "Foo" I became an name error "name 'Bar' is not defined". What I have to do to make it work? I am using Python 2.6.6 if it matters...

.oO(I'm new to Python)

you'll have to show real code, there isn't enough to go on here. — Ned Batchelder
– Ned Batchelder, Commented Feb 14, 2012 at 22:48

David Robinson · Accepted Answer · 2012-02-14 22:50:18Z

4

You need the line

from bar import Bar

in the file foo.py (not just in __init.py__).

answered Feb 14, 2012 at 22:50

David Robinson

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1 Comment

jfs Over a year ago

Don't use implicit relative imports. You could: from package import Bar (relies on the import in __init__.py) or from package.bar import Bar or from .bar import Bar.

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