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Top Forums Programming Interactive Python 3.5+ sys.stdout.write() AND sys.stderr.write() bug? Post 302993112 by wisecracker on Tuesday 7th of March 2017 04:19:36 AM
Old 03-07-2017
After searching the 3.5.x and 3.6.0 documentation and finding absolutely nothing about this someone pointed me to the Python builtin 'help()' function. I never even considered this.
So this is the response:-
Code:
Help on built-in function write:

write(text, /) method of _io.TextIOWrapper instance
    Write string to stream.
    Returns the number of characters written (which is always equal to
    the length of the string).

So it is the 'write' attribute that causes this event and IS NOT an error.
If this number is not stored into a _variable_ it is printed to 'stdout'.
Code:
Last login: Tue Mar  7 08:59:58 on ttys000
AMIGA:amiga~> python3.5
Python 3.5.2 (v3.5.2:4def2a2901a5, Jun 26 2016, 10:47:25) 
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> 
>>> import sys
>>> TEXT="Some string.\n"
>>> sys.stdout.write(TEXT)
Some string.
13
>>> help(sys.stdout.write)

>>> STRLENGTH=sys.stdout.write(TEXT)
Some string.
>>> print(STRLENGTH)
13
>>> len(TEXT)
13
>>> exit()
AMIGA:amiga~> _

Now solved and my mind is at rest.
This User Gave Thanks to wisecracker For This Post:
 

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IDLE(1) 						      General Commands Manual							   IDLE(1)

NAME
IDLE - An Integrated DeveLopment Environment for Python SYNTAX
idle [ -dins ] [ -t title ] [ file ...] idle [ -dins ] [ -t title ] ( -c cmd | -r file ) [ arg ...] idle [ -dins ] [ -t title ] - [ arg ...] DESCRIPTION
This manual page documents briefly the idle command. This manual page was written for Debian because the original program does not have a manual page. For more information, refer to IDLE's help menu. IDLE is an Integrated DeveLopment Environment for Python. IDLE is based on Tkinter, Python's bindings to the Tk widget set. Features are 100% pure Python, multi-windows with multiple undo and Python colorizing, a Python shell window subclass, a debugger. IDLE is cross-plat- form, i.e. it works on all platforms where Tk is installed. OPTIONS
-h Print this help message and exit. -n Run IDLE without a subprocess (see Help/IDLE Help for details). The following options will override the IDLE 'settings' configuration: -e Open an edit window. -i Open a shell window. The following options imply -i and will open a shell: -c cmd Run the command in a shell, or -r file Run script from file. -d Enable the debugger. -s Run $IDLESTARTUP or $PYTHONSTARTUP before anything else. -t title Set title of shell window. A default edit window will be bypassed when -c, -r, or - are used. [arg]* and [file]* are passed to the command (-c) or script (-r) in sys.argv[1:]. EXAMPLES
idle Open an edit window or shell depending on IDLE's configuration. idle foo.py foobar.py Edit the files, also open a shell if configured to start with shell. idle -est "Baz" foo.py Run $IDLESTARTUP or $PYTHONSTARTUP, edit foo.py, and open a shell window with the title "Baz". idle -c "import sys; print sys.argv" "foo" Open a shell window and run the command, passing "-c" in sys.argv[0] and "foo" in sys.argv[1]. idle -d -s -r foo.py "Hello World" Open a shell window, run a startup script, enable the debugger, and run foo.py, passing "foo.py" in sys.argv[0] and "Hello World" in sys.argv[1]. echo "import sys; print sys.argv" | idle - "foobar" Open a shell window, run the script piped in, passing '' in sys.argv[0] and "foobar" in sys.argv[1]. SEE ALSO
python(1). AUTHORS
Various. 21 September 2004 IDLE(1)
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