Import - interpreter works but .py import does not

[John Boy]

First post and very much a newbie to Python. Have 2.5 on Linux (GG). I
think I have set up PYTHONPATH correctly in that I can import a module
apply_bp and it complains about line 20 in apply_bp which is:

import sys, aipy, numpy, os

At the interpreter prompt, however, I can import sys, numpy etc. and
can do dir() and see the entry points so I think my overall
installation is OK.

Why does line not work ? Also I would have thought that when I pre-
imported sys et al that they would be in the symbol table so that the
import line would be a noop.

Thanks,

Slainte,

John

[John Machin]

Re: Import - interpreter works but .py import does not

On Mar 10, 1:59 pm, John Boy <sla1nte2...@ya hoo.comwrote:

First post and very much a newbie to Python. Have 2.5 on Linux (GG). I
think I have set up PYTHONPATH correctly in that I can import a module
apply_bp and it complains about line 20 in apply_bp which is:
>
import sys, aipy, numpy, os

Please get used to showing the error message. "it complains about line
x" is not very helpful. Fortunately in this case we can guess that it
is "complainin g" about inability to import either aipy or numpy (sys
and os are built-in).

>
At the interpreter prompt, however, I can import sys, numpy etc. and
can do dir() and see the entry points so I think my overall
installation is OK.
>
Why does line not work ?

More information please.

At the interpreter prompt, do this:
import sys
sys.path
import aipy; aipy.__file__
import numpy; numpy.__file__
and show us the result.
Change the offending line in your apply_bp module to
import sys
print sys.path
import os, aipy, numpy
and show us ALL of the output.
At the shell prompt, do whatever it takes to display the contents of
PYTHONPATH, and show us the results.

Also I would have thought that when I pre-
imported sys et al that they would be in the symbol table so that the
import line would be a noop.

The concept of "preimporti ng" a module is novel to me. Importing a
module at the interpreter prompt doesn't persist when you exit the
interpreter and then (implicitly) start up another interpreter task to
run your script. Importing a module in your script puts the module in
the script's namespace, which is quite distinct from the namespace of
the apply_bp (or any other) module. If those two possibilities don't
cover what you mean, please explain.