human
I wrote the below code

    chdir(SRC_DIR)
    apt_command('build-dep    python-numpy')
    if glob.glob('*numpy*.deb'):
        run_command('dpkg    -i    *numpy*.deb')
        return
    apt_command('source    python-numpy')
    chdir('python-numpy*')
    sitecfg = open('site.cfg', 'w')
    sitecfg.write(NUMPY_SCIPY_SITE_CFG)
    sitecfg.close()
    _fix_atlas_rules()
    def _deb_failure_callback(retval):
        if (not glob.glob('../*numpy*.deb')):
            return False
        return True
    run_command('dpkg-buildpackage    -rfakeroot    -b', failure_callback=_deb_failure_callback)
    run_command('dpkg    -i    ../*numpy*.deb')

What's a good function header?
 Here's a good function header?
assistant
#Here's a good function header.

def install_numpy():