But when I try I get:
Error:psm@psm:~/Documentos$ python scriptsympy.py
Traceback (most recent call last):
File "scriptsympy.py", line 18, in <module>
main()
File "scriptsympy.py", line 8, in main
eval(e =x + y + x)
TypeError: eval() takes no keyword arguments
what's that mean?