Setting PYTHONPATH from Makefile

[pinkfloydhomer]

I have a Makefile target that uses a python script, like:

%.abc: %.def
python myscript.py

The problem is that myscript.py and some modules that myscript.py
imports are not in the current directory, but in another place in the
filesystem, say, /path/to/stuff. If this was a tcsh script, I would
just do:

setenv PYTHONPATH /path/to/stuff
python myscript.py

but this cannot be done from a Makefile. So what do I do? Is there
another way to set the PYTHONPATH? Like giving an option to "python"
itself? Or?

/David

 

[=?iso-8859-1?Q?Fran=E7ois?= Pinard]

[[email protected]]

I have a Makefile target that uses a python script, like:

%.abc: %.def
python myscript.py

If this was a tcsh script, I would just do:

setenv PYTHONPATH /path/to/stuff
python myscript.py

but this cannot be done from a Makefile.

Use:

%.abc: %.def
PYTHONPATH=/path/to/stuff python myscript.py

In fact, within Make or outside Make, for any shell command, you may
write:

VAR1=VALUE1 VAR2=VALUE2 ... COMMAND ARGUMENTS

so temporarily setting VAR1, VAR2... in the environment for the duration
of COMMAND only. This is a useful feature of the shell.

 

[Mike Meyer]

I have a Makefile target that uses a python script, like:

%.abc: %.def
python myscript.py

The problem is that myscript.py and some modules that myscript.py
imports are not in the current directory, but in another place in the
filesystem, say, /path/to/stuff. If this was a tcsh script, I would
just do:

setenv PYTHONPATH /path/to/stuff
python myscript.py

And that still wouldn't work, because you said that myscript.py wasn't
in the current directory either.

but this cannot be done from a Makefile. So what do I do? Is there
another way to set the PYTHONPATH? Like giving an option to "python"
itself? Or?

No, you can't. You have to tweak the makefile. Try:

%.abc: %.def
(cd /path/to/myscripts/dir; python myscript.py)


N.B. - this probably depends on both the system and the make you're
using.

<mike

 

[Inyeol Lee]

And that still wouldn't work, because you said that myscript.py wasn't
in the current directory either.


No, you can't. You have to tweak the makefile. Try:

%.abc: %.def
(cd /path/to/myscripts/dir; python myscript.py)


N.B. - this probably depends on both the system and the make you're
using.

How about using python -m?
Assuming Make uses Bourne shell,

%.abc: %.def
PYTHONPATH=/path/to/stuff:/path/to/another python -m myscript


Don't forget to strip '.py' extension.

--Inyeol Lee

 

[Mike Meyer]

How about using python -m?
Assuming Make uses Bourne shell,

%.abc: %.def
PYTHONPATH=/path/to/stuff:/path/to/another python -m myscript

That will break __name__ (at least with 2.4.2). Whether or not it
matters will depend on the script.

<mike

 

[Inyeol Lee]

That will break __name__ (at least with 2.4.2). Whether or not it
matters will depend on the script.

$ python -V
Python 2.4.2
$ cat foo/bar.py
print __name__
$ (cd foo; python bar.py)
__main__
$ PYTHONPATH=$PWD/foo python -m bar
__main__
$


Am I missing something? I don't see any issue regarding __name__.

-- Inyeol Lee