How to run windows command line from python script?

Question

I have a script in Python which gives a few files but I also need a log file. Usually I use this command in windows cmd:

py name.py > name.log

This script is part of a project and I need to run it from python. I tried this:

subprocess.call(["py","name.py",">","name.log"])

And it give me all the files that the script prepares but not the log file.

Does this answer your question? append subprocess.Popen output to file? — Daniel F
– Daniel F, Commented Dec 2, 2019 at 18:51

Mert Köklü · Accepted Answer · 2019-12-02 18:51:19Z

3

Use os.system

os.system("py name.py > name.log")

Or, you can just pass an open file handle for the stdout argument to subprocess.call:

args = ['name.py']
cmd = ['py'] + args
with open('name.log', "w") as outfile:
    subprocess.call(cmd, stdout=outfile)

answered Dec 2, 2019 at 18:51

Mert Köklü

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1 Comment

Eryk Sun Over a year ago

Note that when writing to a file or pipe, Windows Python uses the system ANSI codepage by default, which may result in encoding errors. You can override the encoding of standard I/O to UTF-8, e.g. environ = os.environ.copy(); environ['PYTHONIOENCODING'] = 'utf-8'; subprocess.call(cmd, stdout=outfile, env=environ).

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