[Tutor] Newbie question: join() string method

[Alan Gauld]

"Moedeloos Overste" <kloosterjunkie at hotmail.com> wrote

> One question: When I run the program from IDLE it writes the data to 
> file
> but when I run it from the command prompt(win32)  it doesn't. why is 
> this?

How do you know? Have you searched for the file?
Or are you looking in the same file that IDLE produced?
I would expect the code to create a new file in the current
directory - wherever you started the program. Did you look
there?

-----------------------
while vDraws > 0:
    LotNumbers = random.sample(range(1,45), 6) #random numbers from 
range
into list)
    strgOutput=",".join(str(i) for i in LotNumbers) 
#??????converting list
to string to store it.
    fout = open("draw__output.dat", "a")
    fout.write(strgOutput + "\n")  #writing string to file
    fout.close()
--------------------------

It's probably better to put the open/close outside the loop

fout = open(...,'w')
while vDraws > 0
    ...
    fout.write(strgOutput + '\n')
    vDraws -= 1
fout.close()

That way you can use 'w' to write the file(unless you really want the
previous runs to be in there too.) Also this will save the program
opening and closing the file for each line which is quite a slow 
process.

HTH,


-- 
Alan Gauld
Author of the Learn to Program web site
http://www.freenetpages.co.uk/hp/alan.gauld