from formencode import Schema, validators class LinkForm(Schema): username = validators.UnicodeString(not_empty=True) url = validators.URL(not_empty=True, add_http=True, check_exists=False) title = validators.UnicodeString(not_empty=True) class CommentForm(Schema): username = validators.UnicodeString(not_empty=True) content = validators.UnicodeString(not_empty=True)