Hi Richie, thank you for your answer. Your solution is interesting but does not take into account some white spaces (like those after the commas, before or after mathematical operands etc...). Besides that I'm a almost a newbie in Python, and I have the very old programmers' habits (I don't use classes...).
But I have solved nevertheless my problem (with the help of Alex Martelli and his fab method of "tokenize.generate_tokens(cStringIO.StringIO(string).readline" I have read in a clp answer of Alex to a question of Gabor Navy). If someone is interested (I think nobody...) I can give my solution. Bye. -- http://mail.python.org/mailman/listinfo/python-list
