Python and shell command

Question

I have next python code:

exec_cmd = "time"
print exec_cmd  
gzip_cmd = subprocess.Popen(exec_cmd, shell=True, stdout=subprocess.PIPE)
out = gzip_cmd.communicate()[0]
print out

When I try to execute this code I got next:

time
Usage: time [-apvV] [-f format] [-o file] [--append] [--verbose]
       [--portability] [--format=format] [--output=file] [--version]
       [--quiet] [--help] command [arg...]

But when I try to run this command in terminal I got:

time

real    0m0.000s
user    0m0.000s
sys     0m0.000s

So what is the problem?

Do you want to run a program/script named "time" in the same folder as your python script? Then you need to use "./time", because the current working directory in not in the $PATH in Un*x. — Kijewski
– Kijewski, Commented Jul 31, 2014 at 12:10

Fred Foo · Accepted Answer · 2014-07-31 12:07:29Z

5

The "problem" is that time is a Bash built-in, so it's different between Bash and /bin/sh (assuming that's not an alias for Bash--it isn't in Debian/Ubuntu).

answered Jul 31, 2014 at 12:07

Fred Foo

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