site.py 文件源码

def addpackage(sitedir, name, known_paths):
    """Process a .pth file within the site-packages directory:
       For each line in the file, either combine it with sitedir to a path
       and add that to known_paths, or execute it if it starts with 'import '.
    """
    if known_paths is None:
        _init_pathinfo()
        reset = 1
    else:
        reset = 0
    fullname = os.path.join(sitedir, name)
    try:
        f = open(fullname, "rU")
    except IOError:
        return
    with f:
        for n, line in enumerate(f):
            if line.startswith("#"):
                continue
            try:
                if line.startswith(("import ", "import\t")):
                    exec line
                    continue
                line = line.rstrip()
                dir, dircase = makepath(sitedir, line)
                if not dircase in known_paths and os.path.exists(dir):
                    sys.path.append(dir)
                    known_paths.add(dircase)
            except Exception as err:
                print >>sys.stderr, "Error processing line {:d} of {}:\n".format(
                    n+1, fullname)
                for record in traceback.format_exception(*sys.exc_info()):
                    for line in record.splitlines():
                        print >>sys.stderr, '  '+line
                print >>sys.stderr, "\nRemainder of file ignored"
                break
    if reset:
        known_paths = None
    return known_paths