>>> s = "2+2" >>> answer = int(str(s)) Traceback (most recent call last): File "<pyshell#64>", line 1, in ? answer = int(str(s)) ValueError: invalid literal for int(): 2+2 How do I this ? I have a string with a such expression and I want to return the answer in a variable. Regards Dag Hansteen (PS: sorry if I double post, dont know if I sent the other)