Printing to console (No Scroll)

[Totte Karlsson]

Hi,
How can I print to the console without having it scrolling to a new line for
each print statement?
I want to print a count down in the console, but for each count it scrolls
the screen (of course).

Is there another way?

Here is the simple script for now

print "Closing window in :"
for second in range(10):
time.sleep(1)
print `10-second` +" seconds"

thanks
/totte

 

[Diez B. Roggisch]

How can I print to the console without having it scrolling to a new line

for each print statement?
I want to print a count down in the console, but for each count it scrolls
the screen (of course).

Use ncurses.

Diez

 

[Joe Francia]

Hi,
How can I print to the console without having it scrolling to a new line for
each print statement?
I want to print a count down in the console, but for each count it scrolls
the screen (of course).

Is there another way?

Here is the simple script for now

print "Closing window in :"
for second in range(10):
time.sleep(1)
print `10-second` +" seconds"

thanks
/totte

This works for me:

import time, sys
for second in range(10):
time.sleep(1)
sys.stdout.write(`10-second` + " seconds ")
sys.stdout.flush()

 

[Totte Karlsson]

Any alternatives to ncurses? It seems like a overkill for this...
cheers
/totte

 

[Diez B. Roggisch]

Any alternatives to ncurses? It seems like a overkill for this...

Maybe you can use sys.stdout.write in conjunction with control-codes for
moving back the cursor to column one. But you'll have to lookup these for
yourself

Diez

 

[Derek]

Maybe you can use sys.stdout.write in conjunction with control-
codes for moving back the cursor to column one. But you'll have
to lookup these for yourself

I think \r is the control code (at least if you want to go back to the
start of the line):

import time, sys
for second in range(10):
time.sleep(1)
sys.stdout.write(`10-second` + " seconds \r")
sys.stdout.flush()

 

[Totte Karlsson]

Great, thanks for all help! I'll try these things

 

[Samuel Walters]

The cheesy dirt simple way:

print "Closing window in :"
for second in range(10):
time.sleep(1)
#print enough spaces to cover up the last message.
print " "*20 + "\r",
print `10-second` +" seconds",

Note the comma at the end of each print statement.
That causes python not to output a newline.

HTH

Sam Walters.

 

[Dennis Lee Bieber]

Samuel Walters fed this fish to the penguins on Wednesday 14 January
2004 21:30 pm:

print " "*20 + "\r",
print `10-second` +" seconds",

Note the comma at the end of each print statement.
That causes python not to output a newline.

Don't you need a \r on the second print line also? Otherwise the
spaces will be printed at the end of the previous counter value?


Though would \r even work if this was to be run on a Mac -- I thought
Macs used to use \r for line ending (maybe OS-X has gone to \n).


--

 

[Samuel Walters]

| Dennis Lee Bieber said |

Don't you need a \r on the second print line also? Otherwise the
spaces will be printed at the end of the previous counter value?

Um, yeah. You do.

Though would \r even work if this was to be run on a Mac -- I
thought
Macs used to use \r for line ending (maybe OS-X has gone to \n).

I don't know. I've never owned a mac, and haven't ever worked on one.
Thus, mac nuances rarely enter my mind even when I know about them.

Sam Walters.

 

[Dennis Lee Bieber]

Samuel Walters fed this fish to the penguins on Thursday 15 January
2004 17:23 pm:

I don't know. I've never owned a mac, and haven't ever worked on one.
Thus, mac nuances rarely enter my mind even when I know about them.

While I don't know about OS-X (being a BSD/Mach core?), I'm sure the
earlier versions used <CR> (\r) for line endings (I think the TRS-80
did too). The Amiga used <LF> (\n)... And of course, you get the
confusion in Windows of <CR><LF> (but not <LF><CR>!)


--

 

[Valentino Volonghi aka Dialtone]

Any alternatives to ncurses? It seems like a overkill for this...

import sys, time
nrchars = 0

for i in xrange(10):
sys.stdout.write("\b \b"*nrchars)
sys.stdout.flush()
Str = "%i seconds to go" % (10-i)
nrchars = len(Str)
sys.stdout.write(Str)
sys.stdout.flush()
time.sleep(1)
print