utils.py 文件源码

def make_string_from_list(base_str, item_list):
    """ This function takes a list of items and builds a nice human readable
        string with it of the form. Note that the base string needs a "%s".
        Example return:
          The base string with the list items a,b and c in it.
        Note that base_str needs to be a ngettext string already, so the
        example usage is:
         l = ["foo", "bar"]
         base_str = ngettext("This list: %s.", "This list: %s", len(l))
         s = make_string_from_list(base_string, l)
    """
    list_str = item_list[0]
    if len(item_list) > 1:
        # TRANSLATORS: this is a generic list delimit char, e.g. "foo, bar"
        list_str = _(", ").join(item_list[:-1])
        # TRANSLATORS: this is the last part of a list, e.g. "foo, bar and baz"
        list_str = _("%s and %s") % (list_str,
                                     item_list[-1])
    s = base_str % list_str
    return s