How to clear previous console output?

[Newgene]

Hi, group,
May I ask a newbie question?

Given the below example:

for i in range(100):
print "%s%%" % i

I want to show the progress by print 1% to 100%. But I hope each
output will clear the previous output before print, so that I can see a
dynamic updated display of percentage, instead of print all percentages
one by one. How can I do that(what about on both windows and unix
platform)?

Thank you in advance for your expertise.

Best,

Cl

[Mike Rovner]

(For console output) Use \r.

Example:

for i in range(100):
print '%s\r' % ' '*20, # clean up row
print '%d%%' % i, # note ending with comma
print

Note that it works only in real console window, not in simulated one (like
in WinIDE).
That is cross-platform.

HTH,
Mike

Newgene wrote:

I want to show the progress by print 1% to 100%. But I hope each
output will clear the previous output before print, so that I can see
a dynamic updated display of percentage, instead of print all

[Larry Bates]

Try this class I use on both Linux and Windows
(console apps). See main program for example
usage.

HTH,
Larry Bates
class progressbarClas s:
def __init__(self, finalcount, progresschar=No ne):
import sys
self.finalcount =finalcount
self.blockcount =0
#
# See if caller passed me a character to use on the
# progress bar (like "*"). If not use the block
# character that makes it look like a real progress
# bar.
#
if not progresschar: self.block=chr( 178)
else: self.block=prog resschar
#
# Get pointer to sys.stdout so I can use the write/flush
# methods to display the progress bar.
#
self.f=sys.stdo ut
#
# If the final count is zero, don't start the progress gauge
#
if not self.finalcount : return
self.f.write('\ n------------------ %
Progress -------------------1\n')
self.f.write(' 1 2 3 4 5 6 7 8 9 0\n')
self.f.write('----0----0----0----0----0----0----0----0----0----0\n')
return

def progress(self, count):
#
# Make sure I don't try to go off the end (e.g. >100%)
#
count=min(count , self.finalcount )
#
# If finalcount is zero, I'm done
#
if self.finalcount :
percentcomplete =int(round(100* count/self.finalcount ))
if percentcomplete < 1: percentcomplete =1
else:
percentcomplete =100

#print "percentcomplet e=",percentcomp lete
blockcount=int( percentcomplete/2)
#print "blockcount=",b lockcount
if blockcount > self.blockcount :
for i in range(self.bloc kcount,blockcou nt):
self.f.write(se lf.block)
self.f.flush()

if percentcomplete == 100: self.f.write("\ n")
self.blockcount =blockcount
return

if __name__ == "__main__":
from time import sleep
pb=progressbarC lass(8,"*")
count=0
while count<9:
count+=1
pb.progress(cou nt)
sleep(0.2)

pb=progressbarC lass(100)
pb.progress(20)
sleep(0.2)
pb.progress(47)
sleep(0.2)
pb.progress(90)
sleep(0.2)
pb.progress(100 )
print "testing 1:"
pb=progressbarC lass(1)
pb.progress(1)

"Newgene" <ne*****@bigfoo t.com> wrote in message
news:ce******** @odbk17.prod.go ogle.com...

Hi, group,
May I ask a newbie question?

Given the below example:

for i in range(100):
print "%s%%" % i

I want to show the progress by print 1% to 100%. But I hope each
output will clear the previous output before print, so that I can see a
dynamic updated display of percentage, instead of print all percentages
one by one. How can I do that(what about on both windows and unix
platform)?

Thank you in advance for your expertise.

Best,

Cl

[Terry Reedy]

"Mike Rovner" <mi**@nospam.co m> wrote in message
news:ce******** **@sea.gmane.or g...

(For console output) Use \r.

Example:

for i in range(100):
print '%s\r' % ' '*20, # clean up row
print '%d%%' % i, # note ending with comma
print

Note that it works only in real console window, not in simulated one (like in WinIDE).
That is cross-platform.

If you do not want to erase everything, \10 in string inserts backspace
character, but blanking and rewriting everything may be easier.

tjr