code: def get_paths(scheme=_get_default_scheme(), vars=None, expand=True):
      
      _ensure_cfg_read()
      if expand:
          return _expand_vars(scheme, vars)
      else:
          return dict(_SCHEMES.items(scheme))
docs: Return a mapping containing an install scheme.
  
      ``scheme`` is the install scheme name. If not provided, it will
      return the default scheme for the current platform.