[Tutor] Writing to a file...

[Lloyd Kvam]

On Tue, 2004-09-14 at 15:26, Bartz, Gregory H. wrote:
> I'm somewhat new to Python and this is my first question to the list.
> 
> In the example below you can see that it takes four write statements
> to equal one print statement.
> At the moment I'm using print statements and redirecting them to a
> file when I run the script (foo.py > outfile).
> 
> 
> Example using print:
> 
> dimes = 3
> nickels = 5
> numofcoins = dimes + nickels
> money = dimes * 0.1 + nickels * 0.5
> print 'You have ', numofcoins, 'coins totaling $', money

print >> outfile, 'You have ', numofcoins, 'coins totaling $', money

This redirects print statements to a file.

For this kind of filling variables into a string, you can use the string
% operater (string interpolation)

"You have %d coins totaling $%.2f\n" % (numofcoins, money)

builds your output line with a terminating new-line so that it is ready
for write.  Omit the \n if it will be printed.

For details see:

http://docs.python.org/lib/typesseq-strings.html

It's worth reading because it can do more than this simple illustration.


> 
> >>>You have 8 coins totaling $ 0.55
> 
> for the same line, write() is more cumbersome:
> 
> outfile.write('You have ')
> outfile.write(numofcoins)
> outfile.write(' coins totaling $')
> outfile.write(money)
> 
> Is there a more efficient way of doing this, or some way I can
> redirect the output internally?
> 
> -Greg Bartz
> 
> 
> 
> 
> ______________________________________________________________________
> 
> _______________________________________________
> Tutor maillist  -  Tutor at python.org
> http://mail.python.org/mailman/listinfo/tutor
-- 
Lloyd Kvam
Venix Corp