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[Webware-discuss] "No Module named Middle"

From: Hank Freeman <hfreeman@lo...> - 2006-01-19 07:27

I am working on learning MiddleKit, and having a great time.  Things have
gone well until I try to actually build a Store from my model.  After
creating a simple model, generating it, creating the database and it's
objects, and loading my sample data all successfully, I've stumbled.  When I
try to do store.readModelFileNamed(_filename) I get "ModelError: (<path to
my model.mkmodel>', "Could not import module for class '<First class in my
model>' due to 'No module named Middle'.  If you added this class recently,
you need to re-generate your model.')

I have a Settings.config file that contains:
{
    'Package': 'Middle',
    'SQLLOG': {'File': 'mk-sql.log' },
    'Database': 'MyDbNameHere'
}
and my "Middle" directory does have (an empty) __init__.py file to identify
it as a package.

I suspect I'm making a common noob oversite here, but (admitting to being a
newbie) I cannot see it.  Any advice on common pitfalls I might be hitting
here?  Thanks in advance!

Thread View

Thread	Author	Date
[Webware-discuss] "No Module named Middle"	Hank Freeman <hfreeman@lo...>

Re: [Webware-discuss] "No Module named Middle"

From: Chuck Esterbrook <chuck.esterbrook@gm...> - 2006-01-19 19:22

On 1/18/06, Hank Freeman <hfreeman@...> wrote:
> I am working on learning MiddleKit, and having a great time.  Things have
> gone well until I try to actually build a Store from my model.  After
> creating a simple model, generating it, creating the database and it's
> objects, and loading my sample data all successfully, I've stumbled.  Whe=
n I
> try to do store.readModelFileNamed(_filename) I get "ModelError: (<path t=
o
> my model.mkmodel>', "Could not import module for class '<First class in m=
y
> model>' due to 'No module named Middle'.  If you added this class recentl=
y,
> you need to re-generate your model.')
>
> I have a Settings.config file that contains:
> {
>     'Package': 'Middle',
>     'SQLLOG': {'File': 'mk-sql.log' },
>     'Database': 'MyDbNameHere'
> }
> and my "Middle" directory does have (an empty) __init__.py file to identi=
fy
> it as a package.
>
> I suspect I'm making a common noob oversite here, but (admitting to being=
 a
> newbie) I cannot see it.  Any advice on common pitfalls I might be hittin=
g
> here?  Thanks in advance!

The directory containing your Middle directory needs to be in the
python path which is stored in sys.path at runtime, and augmented by
the environment variable PYTHONPATH when Python starts.

I like to make my code impervious to its environment when possible, so
my personal pref is to enhance sys.path in my Python code. Also:

- I also like to make my code impervious to what directory it's run
in, so I don't use absolute paths.
- sys.path[0] is often a blank string or the path of the main python
program. Whatever the case, I never pre-empt it.
- My program is usually "next door" to the Middle directory in another
directory like "bin" or "WebApp".

So given all that, a command line tool I write that uses Middle might say:

import os, sys
progPath =3D os.path.join(os.getcwd(), sys.argv[0])
progDir =3D os.path.dirname(progPath)
projectDir =3D os.path.dirname(projectDir)
assert os.path.exists(projectDir), projectDir
sys.path.insert(1, projectDir)
# now test it:
import Middle


For a WebKit app, you'd do this fixup during context initialization.

Or you could just set the PYTHONPATH environment variable and not
write any Python code.


Btw any time you have problems importing a module, you can "print
sys.path" to help you troubleshoot it, although I find that output
hard to read and do this instead:

for p in sys.path:
    print repr(p)


HTH,
Chuck

RE: [Webware-discuss] "No Module named Middle"

From: Hank Freeman <hfreeman@lo...> - 2006-01-20 03:32

Attachments: Message as HTML

Thank you!  As long as I manually set projectDir to some valid path all that
works for me!  However, you specificaly said that absolute paths should be
avoided, and I agree.  So, how should projectDir be getting set without
doing it overtly?  For the moment this works, so I'm off high-center, but I
need to understand the more general coase for the longer haul.

--Hank
  -----Original Message-----
  From: webware-discuss-admin@...
[mailto:webware-discuss-admin@... Behalf Of Chuck
Esterbrook
  Sent: Thursday, January 19, 2006 11:23 AM
  To: webware-discuss@...
  Subject: Re: [Webware-discuss] "No Module named Middle"


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  On 1/18/06, Hank Freeman <hfreeman@...> wrote:
  > I am working on learning MiddleKit, and having a great time.  Things
have
  > gone well until I try to actually build a Store from my model.  After
  > creating a simple model, generating it, creating the database and it's
  > objects, and loading my sample data all successfully, I've stumbled.
When I
  > try to do store.readModelFileNamed(_filename) I get "ModelError: (<path
to
  > my model.mkmodel>', "Could not import module for class '<First class in
my
  > model>' due to 'No module named Middle'.  If you added this class
recently,
  > you need to re-generate your model.')
  >
  > I have a Settings.config file that contains:
  > {
  >     'Package': 'Middle',
  >     'SQLLOG': {'File': 'mk-sql.log' },
  >     'Database': 'MyDbNameHere'
  > }
  > and my "Middle" directory does have (an empty) __init__.py file to
identify
  > it as a package.
  >
  > I suspect I'm making a common noob oversite here, but (admitting to
being a
  > newbie) I cannot see it.  Any advice on common pitfalls I might be
hitting
  > here?  Thanks in advance!

  The directory containing your Middle directory needs to be in the
  python path which is stored in sys.path at runtime, and augmented by
  the environment variable PYTHONPATH when Python starts.

  I like to make my code impervious to its environment when possible, so
  my personal pref is to enhance sys.path in my Python code. Also:

  - I also like to make my code impervious to what directory it's run
  in, so I don't use absolute paths.
  - sys.path[0] is often a blank string or the path of the main python
  program. Whatever the case, I never pre-empt it.
  - My program is usually "next door" to the Middle directory in another
  directory like "bin" or "WebApp".

  So given all that, a command line tool I write that uses Middle might say:

  import os, sys
  progPath = os.path.join(os.getcwd(), sys.argv[0])
  progDir = os.path.dirname(progPath)
  projectDir = os.path.dirname(projectDir)
  assert os.path.exists(projectDir), projectDir
  sys.path.insert(1, projectDir)
  # now test it:
  import Middle


  For a WebKit app, you'd do this fixup during context initialization.

  Or you could just set the PYTHONPATH environment variable and not
  write any Python code.


  Btw any time you have problems importing a module, you can "print
  sys.path" to help you troubleshoot it, although I find that output
  hard to read and do this instead:

  for p in sys.path:
      print repr(p)


  HTH,
  Chuck


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