I'm pretty comfortable with Python, but recently I'm constantly
finding mysterious issues with import. For example, looking at http://genshi.edgewall.org/browser/t...s/transform.py
the examples use the symbol 'HTML' but it's not defined locally, it's
not explicitly imported, and there's no import *. Yet doctest will
test this module and it passes with flying colors. It turns out HTML
is defined in genshi.input. How do I know that? I grepped for it.
How does it become available to this module?
Another example: I was recently working on some code that did an
import from inside a class method. That import was failing. I moved
the import to the top of the file (at module scope) and it succeeded.
I'm fairly sure that nobody was monkeying around with sys.path in that
case. Can anyone think of a likely explanation?
TIA,
--
Dave Abrahams
Boost Consulting http://www.boost-consulting.com
The Astoria Seminar == http://www.astoriaseminar.com
Jun 21 '07
11  1333 
on Wed Jul 04 2007, Peter Otten <__peter__-AT-web.dewrote:
>>Explicitly passed, see
http://genshi.edgewall.org/browser/t...s/transform.py
>>
IIRC I ran doctest on the file I cited, not the one you're pointing
at. Is there some new magic doctest feature I should know about?
Had you looked at it
Gimme a little credit, please! Of course I looked at it.
you'd seen that the file I pointed to is the driver
script for running the doctests in the file you pointed to
Yes, I saw that, but I don't know of any magic feature that causes the
driver script to get loaded when I invoke doctest directly on the file
I pointed to.
-- unfortunately they have the same name. [...]/tests/transform.py
does indeed inject a HTML object into the globals of
[...]/filters/transform.py before it runs the tests.
Yes, I saw that, but as I said...
Anyway, maybe I just got confused and doctest-ed the driver script.
That certainly would explain everything.
>>>Another example: I was recently working on some code that did an
import from inside a class method. That import was failing. I moved
the import to the top of the file (at module scope) and it succeeded.
I'm fairly sure that nobody was monkeying around with sys.path in that
case. Can anyone think of a likely explanation?
Too vague, sorry.
# this will succeed if I do it here
# import foo.bar
class X:
def y():
import foo.bar # but this fails
Are threads involved? I vaguely remember a problem with Queue.Queue that
came up on this list some time ago.
I don't know, honestly. This was probably in Trac somewhere. I don't
know if it's threaded.
--
Dave Abrahams
Boost Consulting http://www.boost-consulting.com
The Astoria Seminar == http://www.astoriaseminar.com
David Abrahams wrote:
>
on Wed Jul 04 2007, Peter Otten <__peter__-AT-web.dewrote:
>>>Explicitly passed, see
http://genshi.edgewall.org/browser/t...s/transform.py
>>>
IIRC I ran doctest on the file I cited, not the one you're pointing
at. Is there some new magic doctest feature I should know about?
Had you looked at it
Gimme a little credit, please! Of course I looked at it.
Sorry.
>you'd seen that the file I pointed to is the driver
script for running the doctests in the file you pointed to
Yes, I saw that, but I don't know of any magic feature that causes the
driver script to get loaded when I invoke doctest directly on the file
I pointed to.
Nor do I.
>-- unfortunately they have the same name. [...]/tests/transform.py
does indeed inject a HTML object into the globals of
[...]/filters/transform.py before it runs the tests.
Yes, I saw that, but as I said...
Anyway, maybe I just got confused and doctest-ed the driver script.
That certainly would explain everything.
Compelling assumption because it does away with the mystery...
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