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.

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Re: Import Error ('mutual inclusion of modules'?)

[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/programming.html#how-can-i-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.

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Encoding detection in the html parser from libxml2

[icoba]

Hi,

I am parsing html documents using the html parser from libxml2, and if
the encoding is included in the document it works perfectly but if it
is not, I think it does not work well (probably because I am doing
something wrong).

As it is said in http://xmlsoft.org/encoding.html the parser should
detect the encoding. So I tested it putting an utf-8 word in a file and
it does not detect it (it generates a wrong string). Example:
reducción --> reducción.

 I just use the parser as a SAX parser because I do not need a tree, so
to parse the file I use the htmlParseChunk() function and I create the
context with htmlCreatePushParser().

Is it posible that the encoding detection does not work with
htmlParseChunk? If it is so, what method should I use?

Thanks, Cesar

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