Re: os.system question

On Dec 28, 1:32 pm, stanleyxu <no_re...@xxxxxxxxxxxxx> wrote:
kyoso...@xxxxxxxxx wrote:
On Dec 28, 12:57 pm, stanleyxu <no_re...@xxxxxxxxxxxxx> wrote:
To note this problem occurs when debugging script in IDLE editor.
When I double click on my_script.py, all outputs will be printed in one
console.

--
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oo // \\
(_,\/ \_/ \ Xu, Qian
\ \_/_\_/> stanleyxu2005
/_/ \_\

Why are you using os.system for these commands in the first place? You
should be using the os and shutil modules instead as they would be
more cross-platform friendly.

Something like this:

# untested
for new_folder, old_folder in folder_array:
os.mkdir(new_folder)
shutil.copytree(old_folder, new_folder)

Adjust the path as needed in the mkdir call.

See shutil's docs for more info:
http://docs.python.org/lib/module-shutil.html

And here's some folder manipulation docs:
http://effbot.org/librarybook/os.htm

By the by, the subprocess module is supposed to be used in place of
the os.system and os.popen* calls:http://docs.python.org/lib/module-subprocess.html

Mike

Thanks Mike,

you have provided another option.

But my question has not been answered yet. The reason, why I use
os.system(), is that I want to avoid accident file deletion by writing a
script. My real script looks like:



Technically speaking, the shutil module's copytree function will not
delete ANYTHING if the destination already exists. It will just fail.
You could catch the failed copy with a try/except that prints an
appropriate message detailing the error.

# 1. Funtion to execute a command in DOS-console
def execCommand(cmd):
if DEBUG_MODE:
print 'DOS> ' + cmd;
else:
os.system(cmd);

# 2.1 Creates temp folder. Removes it first, if it exists.
if os.path.exists(tmp_folder):
execCommand('RD "' + tmp_folder + '" /S /Q');
execCommand('MD "' + tmp_folder + '"');

# 2.2 Copies all files to the temp folder, that are going to be put in
package.
for source_folder, dest_folder in folders_array:
if not os.path.exists(dest_folder):
execCommand('MD "' + dest_folder + '"');
execCommand('XCOPY \"' + source_folder + '" "' + dest_folder + '" /Y');

The benefit is that, when I set DEBUG_MODE=True, I can see what will be
executed. So that I can make sure that my script will not delete any
other important files by accident.

--
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oo // \\
(_,\/ \_/ \ Xu, Qian
\ \_/_\_/> stanleyxu2005
/_/ \_\


Carl Banks mentioned the subprocess module too and he pointed out its
output redirection capabilities. I recommend checking those out too.
You may be able to do some redirection by changing where stdout and
stderr print to.

Mike
.