all.py 文件源码

def __import__(name, globals=None, locals=None, fromlist=None):
    """An alternative to the import function so that we can import
    modules defined as strings.

    This code was taken from: http://docs.python.org/lib/examples-imp.html
    """
    # Fast path: see if the module has already been imported.
    try:
        return sys.modules[name]
    except KeyError:
        pass

    # If any of the following calls raises an exception,
    # there's a problem we can't handle -- let the caller handle it.
    module_name = name.split('.')[-1]
    module_path = os.path.join(EXAMPLE_DIR, *name.split('.')[:-1])

    fp, pathname, description = imp.find_module(module_name, [module_path])

    try:
        return imp.load_module(module_name, fp, pathname, description)
    finally:
        # Since we may exit via an exception, close fp explicitly.
        if fp:
            fp.close()