mattia wrote:
Il Fri, 16 Oct 2009 22:40:34 -0700, Dennis Lee Bieber ha scritto:
On Fri, 16 Oct 2009 23:39:38 -0400, Dave Angel <da...@ieee.org>
declaimed the following in gmane.comp.python.general:
You're presumably testing this in the interpreter, which prints extra
stuff. In particular, it prints the result value of any expressions
entered at the interpreter prompt. So if you type
sys.stdout.write("hello")
then after the write() method is done, the return value of the method
(5) will get printed by the interpreter.
I was about to respond that way myself, but before doing so I
wanted
to produce an example in the interpreter window... But no effect?
C:\Documents and Settings\Dennis Lee Bieber>python ActivePython 2.5.2.2
(ActiveState Software Inc.) based on Python 2.5.2 (r252:60911, Mar 27
2008, 17:57:18) [MSC v.1310 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
import sys
sys.stdout.write("hello")
hello>>>
PythonWin 2.5.2 (r252:60911, Mar 27 2008, 17:57:18) [MSC v.1310 32 bit
(Intel)] on win32.
Portions Copyright 1994-2006 Mark Hammond - see 'Help/About PythonWin'
for further copyright information.
import sys
sys.stdout.write("This is a test")
This is a test
print sys.stdout.write("Hello")
HelloNone
No count shows up... neither PythonWin or Windows command line/
shell
Indeed I'm using py3. But now everythong is fine. Everything I just
wanted to know was just to run this simple script (I've also sent the msg
'putchar(8)' to the newsgroup):
import time
import sys
val = ("|", "/", "-", "\\", "|", "/", "-", "\\")
for i in range(100+1):
print("=", end="")
# print("| ", end="")
print(val[i%len(val)], " ", sep="", end="")
print(i, "%", sep="", end="")
sys.stdout.flush()
time.sleep(0.1)
if i > 9:
print("\x08"*5, " "*5, "\x08"*5, sep="", end="")
else:
print("\x08"*4, " "*4, "\x08"*4, sep="", end="")
print(" 100%\nDownload complete!")
Seems to me you're spending too much energy defeating the things that
print() is automatically doing for you. The whole point of write() is
that it doesn't do anything but ship your string to the file/device. So
if you want control, do your own formatting.
Consider:
import time, sys, itertools
val = ("|", "/", "-", "\\", "|", "/", "-", "\\")
sys.stdout.write(" ")
pattern = "\x08"*8 + " {0}{1:02d}%"
for percentage, string in enumerate(itertools.cycle(val)):
if percentage>99 : break
paddednum = pattern.format(string, percentage)
sys.stdout.write(paddednum)
sys.stdout.flush()
time.sleep(0.1)
print("\x08\x08\x08\x08 100%\nDownload complete!")
Note the use of cycle() which effectively repeats a list indefinitely.
And enumerate, which makes an index for you automatically when you're
iterating through a list. And str.format() that builds our string,
including using 0 padding so the percentages are always two digits.
DaveA
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