regsetup.py 文件源码

def LocatePythonCore(searchPaths):
    """Locate and validate the core Python directories.  Returns a list
     of paths that should be used as the core (ie, un-named) portion of
     the Python path.
    """
    import os, regutil
    currentPath = regutil.GetRegisteredNamedPath(None)
    if currentPath:
        presearchPaths = currentPath.split(";")
    else:
        presearchPaths = [os.path.abspath(".")]
    libPath = None
    for path in presearchPaths:
        if FileExists(os.path.join(path, "os.py")):
            libPath = path
            break
    if libPath is None and searchPaths is not None:
        libPath = LocatePath("os.py", searchPaths)
    if libPath is None:
        raise error("The core Python library could not be located.")

    corePath = None
    suffix = IsDebug()
    for path in presearchPaths:
        if FileExists(os.path.join(path, "unicodedata%s.pyd" % suffix)):
            corePath = path
            break
    if corePath is None and searchPaths is not None:
        corePath = LocatePath("unicodedata%s.pyd" % suffix, searchPaths)
    if corePath is None:
        raise error("The core Python path could not be located.")

    installPath = os.path.abspath(os.path.join(libPath, ".."))
    return installPath, [libPath, corePath]