Import Error ('mutual inclusion of modules'?)

[icoba]

I have the following code:

A.py
====

from B import B

class R:
def __str__(self):
return "hello world"

b = B()
print b


B.py
====

from A import R


class B:

def __init__(self):
self.r = R()

def __str__(self):
return self.r.__str__()

When I try to execute A.py I get the following error:

[python2.3]$ python A.py
Traceback (most recent call last):
File "A.py", line 1, in ?
from B import B
File "python2.3/B.py", line 1, in ?
from A import R
File "python2.3/A.py", line 1, in ?
from B import B
ImportError: cannot import name B


I think python does not support this kind of 'mutual inclusion'. Am I
right? Thanks. Cesar.

 

[Fredrik Lundh]

I have the following code:

A.py
====

from B import B

B.py
====

from A import R

I think python does not support this kind of 'mutual inclusion'. Am I
right? Thanks. Cesar.

this page

http://effbot.org/zone/import-confusion.htm

might help you figure out what's going on here.

</F>

 

[icoba]

Thanks,
I had not found anything about it. But I had not search correctly.
There is an entry in the FAQ about it:

http://www.python.org/doc/faq/progr...-have-modules-that-mutually-import-each-other

I like the most the third way.
I have also tried to move the import to the __init__ methos in B.py and
it works.