problem with import / namespace

[ohad frand]

Hi
Thanks for the answer.
I probably didnt write the problem accurately but it is not as you
described.
(i already read before the section that you pointed and it didnt help me)
the problem is that i dont want to import a file from different directory
but only from the same directory.
\\1\tmp2.py imports \\1\tmp1.py
\\2\tmp2.py imports \\2\tmp2.py
but when i execute the following script in the interpreter i get that the
second tmp2.py file imports not the file from the same directory but the
file that was already imported by the first executed tmp2.py file.
the shell script is:
>>> import os
>>> os.chdir("c:\\1")
>>> execfile("tmp2.py") <- here the executaion is OK
>>> os.chdir("c:\\2")
>>> execfile("tmp2.py") <- here the execution is not ok because tmp2.py file
imports the tmp1.py file from c:\\1 which is not OK

in between those two execfile commands i tried to do a lot of things but
every time python imported the incorrect file for the second execution. (i
am not building a package and those names are just examples for the problem,
i am not really using 1 and 2 names as dirs)

I hope that this time i am more understood

Thanks again
Ohad


On Wed, May 21, 2008 at 4:46 PM, Laszlo Nagy <gandalf at shopzeus.com> wrote:

> ohad frand wrote:
>
>> Hi
>> I have a problem that the solution to it must be very simple but i couldnt
>> fint it's answer in the internet so far (i searched for couple of days)
>> the problme is as follows:
>>
>> i have two directories e.g. "\\1" and "\\2"
>> in each directory i have two files with the same names e.g. "tmp1.py" and
>> "tmp2.py"
>>
>
> So this is what you have:
>
> /1/tmp1.py
> /1/tmp2.py
> /2/tmp1.py
> /2/tmp2.py
>
>  each tmp2.py file imports tmp1 from its same directory (import tmp1) -
>> thats the problem
>> if i execute one file (\\1\tmp2.py) than the execution is ok
>> but when i try after that to execute the second file (\\2\tmp2.py) than
>> the tmp1 file from the wrong directory ( - directory 1 in this case) is
>> imported instead.
>>
>
> When you try to import a module, python starts to search for it. The was it
> does the search is very well defined. It mostly depends on the current
> directory and sys.path. You can read more about this here:
>
> http://docs.python.org/tut/node8.html#searchPath
>
> This is very basic thing - you should read and go through the tutorial
> before asking questions like this. :-)
>
>  i tried many things to try to solve it, i removed the previous path from
>> sys.path and added the new one, i tried to change current working directory
>> with os.chdir()
>> I tried to delete from locals and from globals the name tmp1 before
>> running the second file but nothing worked.
>> please help
>>
> The problem is still not well defined. Python works as expected and
> documented, but apparently you do not know how to import 1/tmp2.py from
> 2/tmp1.py.  There are several ways to do it, and we cannot tell which one is
> correct. It depends on what are these modules for.
>
> Here are the solution that you would use (most likely) as a beginner:
>
>
> #1 first, rename your "1" and "2" directories to "one" and "two". If you
> are creating a package with modules, then you have to define the package's
> name with its directory. Since identifiers cannot begin with digits in
> Python, you need to use an identifier-like name for your subdirs. It is a
> good idea anyway. A package name called "1" would tell nothing about what it
> does?
> #2 place your main application in /app/app.py
> #3 create /app/one/__init__.py and /app/two/__init__.py files (they can be
> empty)
> - inside your app.py file either make sure that the current dir is /app, or
> insert /app in the first place in sys.path
>
>
> Then for example, inside two/tmp1.py you can do this:
>
>
> import one.tmp1
> import one.tmp2
> import two.tmp1
>
> one.tmp1.somefunc()
> two.tmp1.somefunc()
>
>
> You got the idea.
>
>   Laszlo
>
>
>
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