Detected a dynamic value being used with urllib. urllib supports 'file://' schemes, so a dynamic value controlled by a malicious actor may allow them to read arbitrary files. Audit uses of urllib calls to ensure user data cannot control the URLs, or consider using the 'requests' library instead.
local_filename, headers = urllib.request.urlretrieve('http://cidades.ibge.gov.br/xtras/csv.php?lang=&idtema=' + idtema + '&codmun=' + codmun)