docs: def load(pattern, *args, **kw):
    '''
    Given a package asset-spec glob-pattern `pattern`, returns an
    :class:`AssetGroup` object, which in turn can act as a generator of
    :class:`Asset` objects that match the pattern.
  
    Example:
  
    .. code-block:: python
  
      import asset
  
      # concatenate all 'css' files into one string:
      css = asset.load('mypackage:static/style/**.css').read()
  
    '''
  
    spec = pattern
  
    if ':' not in pattern:
      raise ValueError('`pattern` must be in the format "PACKAGE:GLOB"')
  
    pkgname, pkgpat = pattern.split(':', 1)
    pkgdir, pattern = globre.compile(pkgpat, split_prefix=True, flags=globre.EXACT)
  
    if pkgdir:
      idx = pkgdir.rfind('/')
      pkgdir = pkgdir[:idx] if idx >= 0 else ''
  
    group = AssetGroup(pkgname, pkgdir, pattern, spec)
    if globre.iswild(pkgpat):
      return group
    return Asset(group, pkgname, pkgpat)