On Mon, Dec 21, 2009 at 2:57 PM, W. eWatson <wolftra...@invalid.com> wrote: > This has got to be some sort of IDLE issue then.
Huh? How do you figure? > When I run a simple > program. If I open this program in the IDLE editor: > #import math > print "hello, math world." > print cos(0.5) > print sin(0.8) > > then I get > print cos(0.5) > NameError: name 'cos' is not defined Of course, because -- cos is not defined. As I stated in my previous email, "math" has to be imported to be used. > > OK, >>> dir() > ['__builtins__', '__doc__', '__file__', '__name__', 'idlelib'] > > Fine. I now change the code to include import mat get the same: > print cos(0.5) > NameError: name 'cos' is not defined Yes, because cos is inside math. [snip > Now, I go to the script and enter > from math import * > dir is now bulked up with the math functions. I change back math.cos to cos > and the program runs well. > > This sort of figures. Apparently, I've added to the namespace by importing > with *. Apparently? -- you precisely and explicitly added every object in 'math' to your current namespace. "from math import *" does precisely that. > My point is that I'm betting different results. OK, fine. It appears the > same thing happens with I modify the program itself with from math import * Different results? What different results are you talking about? If you want to access 'sin' without 'math.', you'll have to do 'from math import *' in each file where you want to do that. > So IDLE is not clearing the namespace each time I *run* the program. This is > not good. I've been fooled. So how do I either clear the namespace before > each Run? Do I have to open the file in the editor again each time before > trying to Run it? I hope there's a better way. How do you figure its 'not clearing the namespace'? In which namespace? I fire up IDLE, and start a new file, and put in a single line: "a = 1". I choose Run Module, and it runs it. I verify in the interactive interpreter that a is 1. I then change that file to "a = a + 1", and run it. Now, it errors out-- of course-- because IDLE "cleared" the namespace and re-ran the module. It says in the interpreter its restarting, even. --S -- http://mail.python.org/mailman/listinfo/python-list
