reload.py 文件源码

def reloadAll(prefix=None, debug=False):
    """Automatically reload everything whose __file__ begins with prefix.
    - Skips reload if the file has not been updated (if .pyc is newer than .py)
    - if prefix is None, checks all loaded modules
    """
    failed = []
    changed = []
    for modName, mod in list(sys.modules.items()):  ## don't use iteritems; size may change during reload
        if not inspect.ismodule(mod):
            continue
        if modName == '__main__':
            continue

        ## Ignore if the file name does not start with prefix
        if not hasattr(mod, '__file__') or os.path.splitext(mod.__file__)[1] not in ['.py', '.pyc']:
            continue
        if prefix is not None and mod.__file__[:len(prefix)] != prefix:
            continue

        ## ignore if the .pyc is newer than the .py (or if there is no pyc or py)
        py = os.path.splitext(mod.__file__)[0] + '.py'
        pyc = py + 'c'
        if py not in changed and os.path.isfile(pyc) and os.path.isfile(py) and os.stat(pyc).st_mtime >= os.stat(py).st_mtime:
            #if debug:
                #print "Ignoring module %s; unchanged" % str(mod)
            continue
        changed.append(py)  ## keep track of which modules have changed to insure that duplicate-import modules get reloaded.

        try:
            reload(mod, debug=debug)
        except:
            printExc("Error while reloading module %s, skipping\n" % mod)
            failed.append(mod.__name__)

    if len(failed) > 0:
        raise Exception("Some modules failed to reload: %s" % ', '.join(failed))