[Paparazzi-devel] ?? can't install python in my iMac

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Hello! I wanna install python in my OSX(lion 10.7.4),but I meet some errors. I wanna know that what causes these errors and how can I fix it? Thanks for your help.

I input:"sudo port install py27-pyusb-devel. "

then it responds:

--->  Computing dependencies for py27-pyusb-devel

--->  Dependencies to be installed: python27

--->  Installing python27 @2.7.3_0

Error: org.macports.install for port python27 returned: no destroot found at: /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_python27/python27/work/destroot

Error: Failed to install python27

Please see the log file for port python27 for details:

    /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_python27/python27/main.log

Error: The following dependencies were not installed: python27

To report a bug, follow the instructions in the guide:

    http://guide.macports.org/#project.tickets

Error: Processing of port py27-pyusb-devel failed