def split_options(opts, validate=True, warn=False, normalize=True):
    """Takes the options portion of a MongoDB URI, validates each option
    and returns the options in a dictionary.

    :Parameters:
        - `opt`: A string representing MongoDB URI options.
        - `validate`: If ``True`` (the default), validate and normalize all
          options.
        - `warn`: If ``False`` (the default), suppress all warnings raised
          during validation of options.
        - `normalize`: If ``True`` (the default), renames all options to their
          internally-used names.
    """
    and_idx = opts.find("&")
    semi_idx = opts.find(";")
    try:
        if and_idx >= 0 and semi_idx >= 0:
            raise InvalidURI("Can not mix '&' and ';' for option separators.")
        elif and_idx >= 0:
            options = _parse_options(opts, "&")
        elif semi_idx >= 0:
            options = _parse_options(opts, ";")
        elif opts.find("=") != -1:
            options = _parse_options(opts, None)
        else:
            raise ValueError
    except ValueError:
        raise InvalidURI("MongoDB URI options are key=value pairs.")

    options = _handle_security_options(options)

    options = _handle_option_deprecations(options)

    if validate:
        options = validate_options(options, warn)

    if normalize:
        options = _normalize_options(options)

    return options
Takes the options portion of a MongoDB URI, validates each option
    and returns the options in a dictionary.

    :Parameters:
        - `opt`: A string representing MongoDB URI options.
        - `validate`: If ``True`` (the default), validate and normalize all
          options.
        - `warn`: If ``False`` (the default), suppress all warnings raised
          during validation of options.
        - `normalize`: If ``True`` (the default), renames all options to their
          internally-used names.
    
stackoverflow/venv/lib/python3.6/site-packages/pymongo/uri_parser.py