[Tutor] Trouble running Python on Windows Vista

[Tom Avos]

Hi there,
I'm learning Python. I have to work with a Notebook running Widows Vista Home Premium.(have no other choice)
It works fine when working in Interactive Mode or by  Opening a .py file from the IDLE and then running it by pressing F5, but I can not run .py files by invoking them from the prompt (neither from IDLE nor Dos Command Line); 
 
Every time I try to do this I get the following error:(In this case I'm tryig to invoke triangulo.py saved in C:\python27); 
 
>>> triangulo.py
Traceback (most recent call last):
  File "<pyshell#3>", line 1, in <module>
    triangulo.py
NameError: name 'triangulo' is not defined
>>> 
 
The same happens for every file I want to run by calling them from the prompt, although if I double click on any .py file it runs ok.
 
I've installed Python as follows:
 
I've downloaded the Python 2.7.3 Windows Installer from www.python.org/download/. 
Once I've got it I run the installer and Python was installed on C:\Python27, and I've added Python to the my directory by doing set path=%path%;C:\python27.
 
Any ideas will be very welcome :-)
Thanks in advance for your attention.
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