arguments from the prompt

[Thomas A. Bryan]

joe at localhost.localdomain wrote:

> it says NameError: sys

> #!/usr/bin/python
> from sys import argv
> 
> a=sys.argv[1]


When you use 'from sys import argv', the symbol 'argv' is now 
available to your code directly.  You no longer have to reference 
the module name.  In fact, sys is *not* available after you run 
'from sys import argv' just like it isn't available after you run 
'from sys import *'.  If you simply write 'import sys', then the 
symbol 'sys' is avialable, but 'argv' is only accessible through sys.

So, either write

from sys import argv
a = argv[1]

or 

import sys
a = sys.argv[1]

---Tom