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Date: Fri, 19 Dec 2014 14:51:15 -0800
Subject: Changing script's search path at install time
From: Mitko Haralanov <m.haralanov@gmail.com>
To: python-list@python.org
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Hi all,

I have a question regarding installation of Python scripts and modules
using distutils that I can't find an answer to by searching through Google
and the Python website. Hopefully, someone on this list might have ideas?

I am writing a Python app, which I would eventually like to install using
disutils. The app has the current tree strucutre:

<root>
  |----- myapp.py
  |----- modules/
               |------  lib/
                         |------  __init__.py
                         |------  mymodule1.py
                         |------  mymdule2.py
               |------- cmds/
                         |------  __init__.py
                         |------  cmds1.py

Naturally, in order for my app to properly import the modules, currently it
uses the following code:

    import modules.lib.mymodule1
    import modules.lib.mymodule2
    import modules.cmds.cmds1

However, when the app gets installed, I would like to install the modules
to /usr/lib64/pythonX.Y/site-packages/myapp. I know that I can do this by
using the "package_dir" argument to the "setup()" function in
distutils.core.

To make development easier I would like to be able to run the myapp.py
script from the development directory, which means that the import
statements have to remain as they are. The issue is that when the script is
installed, the import statements will not work anymore since the directory
name has been changed from "modules" to "myapp".

My problem is that I can't figure out how to modify the myapp.py script to
switch from "modules.lib.mymodule1" to "myapp.lib.module1" at install time.
Does anyone have any useful hints?

Thank you,
- Mitko

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<div dir=3D"ltr">Hi all,<div><br></div><div>I have a question regarding ins=
tallation of Python scripts and modules using distutils that I can&#39;t fi=
nd an answer to by searching through Google and the Python website. Hopeful=
ly, someone on this list might have ideas?</div><div><br></div><div>I am wr=
iting a Python app, which I would eventually like to install using disutils=
. The app has the current tree strucutre:</div><div><br></div><div>&lt;root=
&gt;</div><div>=C2=A0 |----- myapp.py</div><div>=C2=A0 |----- modules/</div=
><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|------ =C2=A0=
lib/</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|------ =C2=A0__init__.py</div><div>=C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0|------ =C2=A0mymodule1.py</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|------ =C2=
=A0mymdule2.py</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|------- cmds/</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|------ =C2=A0__init__.py</=
div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0|------ =C2=A0cmds1.py</div><div><br></div><div>Nat=
urally, in order for my app to properly import the modules, currently it us=
es the following code:</div><div><br></div><div>=C2=A0 =C2=A0 import module=
s.lib.mymodule1</div><div>=C2=A0 =C2=A0 import modules.lib.mymodule2</div><=
div>=C2=A0 =C2=A0 import modules.cmds.cmds1</div><div><br></div><div>Howeve=
r, when the app gets installed, I would like to install the modules to /usr=
/lib64/pythonX.Y/site-packages/myapp. I know that I can do this by using th=
e &quot;package_dir&quot; argument to the &quot;setup()&quot; function in d=
istutils.core.</div><div><br></div><div>To make development easier I would =
like to be able to run the myapp.py script from the development directory, =
which means that the import statements have to remain as they are. The issu=
e is that when the script is installed, the import statements will not work=
 anymore since the directory name has been changed from &quot;modules&quot;=
 to &quot;myapp&quot;.</div><div><br></div><div>My problem is that I can&#3=
9;t figure out how to modify the myapp.py script to switch from &quot;modul=
es.lib.mymodule1&quot; to &quot;myapp.lib.module1&quot; at install time. Do=
es anyone have any useful hints?</div><div><br></div><div>Thank you,</div><=
div>- Mitko</div><div><br></div><div><br></div></div>

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