installing python library modules (general question)

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  • Julia Goolia
    #1

    installing python library modules (general question)

    Hi,

    I'm sure this issue has been brought up a billion times... but I'm
    having trouble installing a python module. I have read all the
    documentation for all the buzz words I know related to this problem
    but to no avail.

    Basically I downloaded a python module called pymad. This module is
    supposed to be simplified API to libmad (an mp3 decoder) (I want to
    play mp3's from python).

    I installed libmad. The libraries appear to be in /usr/local/lib. I
    did all the distutils stuff for the module. Now when I try to "import
    mad" I get an ImportError exception:

    ImportError: libmad.so.0: cannot open shared object file: No such file
    or directory

    I know the file /usr/local/lib/libmad.so.0 exists, but python can't
    seem to find it. I tried adding this path to LD_LIBRARY_PATH , but
    that didn't help.

    I guess that I just really dont' know enought about libraries and
    linux (redhat 9). I don't really know where they are supposed to go
    after being compiled, and how python "loads" and uses them.

    Any help is much appreciated,
    Julia
    Tags: None
    • Martin v. Löwis
      #2
      Re: installing python library modules (general question)

      juliagoolia301@ hotmail.com (Julia Goolia) writes:
      [color=blue]
      > ImportError: libmad.so.0: cannot open shared object file: No such file
      > or directory
      >
      > I know the file /usr/local/lib/libmad.so.0 exists, but python can't
      > seem to find it. I tried adding this path to LD_LIBRARY_PATH , but
      > that didn't help.[/color]

      Can you please be precise on what "this path" is? Adding
      "/usr/local/lib/libmad.so.0" would be wrong, whereas adding
      "/usr/local/lib" should work.
      [color=blue]
      > I guess that I just really dont' know enought about libraries and
      > linux (redhat 9). I don't really know where they are supposed to go
      > after being compiled, and how python "loads" and uses them.[/color]

      You might also edit /etc/ld.so.conf to add /usr/local/lib, and run
      ldconfig afterwards; this would remove the need to set LD_LIBRARY_PATH

      HTH,
      Martin

        Comment

        • Lee Harr
          #3
          Re: installing python library modules (general question)

          > ImportError: libmad.so.0: cannot open shared object file: No such file[color=blue]
          > or directory
          >
          > I know the file /usr/local/lib/libmad.so.0 exists, but python can't
          > seem to find it. I tried adding this path to LD_LIBRARY_PATH , but
          > that didn't help.
          >
          > I guess that I just really dont' know enought about libraries and
          > linux (redhat 9). I don't really know where they are supposed to go
          > after being compiled, and how python "loads" and uses them.
          >[/color]


          Where are your other python libraries? On my system, they are in:

          /usr/local/lib/python2.2/

          and then modules that get added by distutils go in:

          /usr/local/lib/python2.2/site-packages/

          I have a bunch of libfoo.so and libbaz.so.1 type files in there, so
          I think if you have a directory like that you should try dropping
          your libmad.so.0 in there.

            Comment

            • Jeff Epler
              #4
              Re: installing python library modules (general question)

              Add /usr/local/lib to the list of directories in /etc/ld.so.conf and
              then execute /sbin/ldconfig to create some needed symlinks in
              /usr/local/lib.

              Jeff

                Comment

                • Julia Goolia
                  #5
                  Re: installing python library modules (general question)

                  jeff,

                  you are a gentleman and a scholar. that worked like a charm. thank
                  you so much. just so i know... adding something to /etc/ld/so/conf is
                  different than setting LD_LIBRARY_PATH ? what do you do if you don't
                  have root access?

                  thanks again,
                  julia

                  Jeff Epler <jepler@unpytho nic.net> wrote in message news:<mailman.1 058113998.31950 [email protected] >...[color=blue]
                  > Add /usr/local/lib to the list of directories in /etc/ld.so.conf and
                  > then execute /sbin/ldconfig to create some needed symlinks in
                  > /usr/local/lib.
                  >
                  > Jeff[/color]

                    Comment

                    • Matthias Baas
                      #6
                      Re: installing python library modules (general question)

                      On 13 Jul 2003 15:34:36 -0700, juliagoolia301@ hotmail.com (Julia
                      Goolia) wrote:[color=blue]
                      >you so much. just so i know... adding something to /etc/ld/so/conf is
                      >different than setting LD_LIBRARY_PATH ?[/color]

                      The result should actually be the same. Maybe there was a typo when
                      you set the path in LD_LIBRARY_PATH , this can easily happen (see
                      above, the config file is actually /etc/ld.so.conf.... ;-)

                      By the way, if you want to know how loading libraries works, have a
                      look at this HOWTO (section 3):

                      http://www.ibiblio.org/pub/Linux/docs/HOWTO/other-formats/html_single/Program-Library-HOWTO.html


                      (this and more documentation can be found at "The Linux Documentation
                      Project": http://www.tldp.org/)
                      [color=blue]
                      >what do you do if you don't ave root access?[/color]

                      Then you actually do use LD_LIBRARY_PATH .

                      - Matthias -

                        Comment

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