Problems with sys.stout.flush()

[Hendrik van Rooyen]

"Joel Ross" <[email protected]>
To: <[email protected]>
Sent: Sunday, May 24, 2009 4:32 AM
Subject: Re: Problems with sys.stout.flush()

Rhodri James wrote: [ ... ]
Except that you still have the interesting issue that your environment
isn't responding to '\r' correctly, which worries me rather. Or did
you never test that?

Yeah I gave the "\r" a go and it kept printing out on a new line I will
look into it.

Are you running an Apple computer?

Mel.

No running a Linux fedora 9 box

Was the last character of your print command a comma?

- Hendrik

 

[Joel Ross]

import time, sys

print "ONE",
sys.stdout.flush()
time.sleep(0.5)
print "\rTWO",
sys.stdout.flush()
time.sleep(0.5)

Running the command above prints out
ONE
TWO

but running

for i in range(10):
print "ONE",
time.sleep(0.2)

prints out
ONE ONE ONE ONE ONE ONE ONE ONE ONE ONE

like Hendrik mentioned adding comma to the end prints out on one line.
But my problem problem wasn't printing on one line it was mathematical
each time I printed on one line it was appending the print before. Which
is all the above command does anyway. I had to apply some maths to solve
the issue I was having which was printing out a progress bar. I Got it
working though.

jross

 

[Dennis Lee Bieber]

Running the command above prints out
ONE
TWO

Both of the following work in a Windows command shell

-=-=-=-=-=-
C:\DOCUME~1\DENNIS~1>type t.py
import sys
import time
for i in range(10):
print "one\r",
time.sleep(1)
print "two\r",
time.sleep(1)

C:\DOCUME~1\DENNIS~1>t.py
two
C:\DOCUME~1\DENNIS~1>
-=-=-=-=-=-
C:\DOCUME~1\DENNIS~1>edit t.py

C:\DOCUME~1\DENNIS~1>type t.py
import sys
import time
for i in range(10):
print "\rone",
time.sleep(1)
print "\rtwo",
time.sleep(1)


C:\DOCUME~1\DENNIS~1>t.py
two

C:\DOCUME~1\DENNIS~1>
-=-=-=-=-=-

So... combining the "print ... ," with a "\r" at either the front or
end would have worked with your original computation (where you were
printing one * per percentage point).

The nice thing about this method is that you can (if you print
enough blanks too) overwrite the full line to "shrink" the bar if
needed.
--
Wulfraed Dennis Lee Bieber KD6MOG
(e-mail address removed) (e-mail address removed)
HTTP://wlfraed.home.netcom.com/
(Bestiaria Support Staff: (e-mail address removed))
HTTP://www.bestiaria.com/