deepreload.py 文件源码

def deep_reload_hook(m):
    """Replacement for reload()."""
    # Hardcode this one  as it would raise a NotImplemeentedError from the
    # bowels of Python and screw up the import machinery after.
    # unlike other imports the `exclude` list aleady in place is not enough.

    if m is types:
        return m
    if not isinstance(m, ModuleType):
        raise TypeError("reload() argument must be module")

    name = m.__name__

    if name not in sys.modules:
        raise ImportError("reload(): module %.200s not in sys.modules" % name)

    global modules_reloading
    try:
        return modules_reloading[name]
    except:
        modules_reloading[name] = m

    dot = name.rfind('.')
    if dot < 0:
        subname = name
        path = None
    else:
        try:
            parent = sys.modules[name[:dot]]
        except KeyError:
            modules_reloading.clear()
            raise ImportError("reload(): parent %.200s not in sys.modules" % name[:dot])
        subname = name[dot+1:]
        path = getattr(parent, "__path__", None)

    try:
        # This appears to be necessary on Python 3, because imp.find_module()
        # tries to import standard libraries (like io) itself, and we don't
        # want them to be processed by our deep_import_hook.
        with replace_import_hook(original_import):
            fp, filename, stuff  = imp.find_module(subname, path)
    finally:
        modules_reloading.clear()

    try:
        newm = imp.load_module(name, fp, filename, stuff)
    except:
         # load_module probably removed name from modules because of
         # the error.  Put back the original module object.
        sys.modules[name] = m
        raise
    finally:
        if fp: fp.close()

    modules_reloading.clear()
    return newm

# Save the original hooks