Jankins wrote:
On Nov 23, 4:08 pm, "Diez B. Roggisch" <de...@nospam.web.de> wrote:
Jankins schrieb:
I am trying to use sys.stdout to print out "process-bar" like:
-->1%
Here is my program ‘test.py’:
from sys import stdout
for v in range(10):
stdout.write('-->%d' % v)
stdout.flush()
else:
stdout.write('done!')
#end for
Then, I use 'python -u test.py' to run this script. But what I get
is :
-->0-->1-->2-->3-->4-->5-->6-->7-->8-->9done!
I am suppose to get 'done!'.
Can anybody help me about this?
You misunderstand what "flush" means. It is not about clearing the
screen, or the line.
Try printing
stdout.write('\r-->%d')
Diez
But there is still a problem. When you use control character '\r', you
actually move to the head of the current buffer line and overwrite it.
So if I use this way:
for i in range(100, 0,-1)
The tail of the buffer is not overwrote.
How to solve this problem?
Thanks.
No idea what you mean by "buffer line." This is moving the cursor
around on the console.
Anyway, for such a loop, just make sure all the strings are the same
length. Or just cheat and always write a few blanks at the end.
sys.stdout.write("\r -- %5d" % i)
should do it, for up to 5 digit values
DaveA
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