Run An External Command From A Python Script
Code
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Results
Hello world
NOTE:
If the return code isn't `0` You might be able to get the error from
print(echo_cmd.stderr.decode('utf-8').strip())
NOTE:
If you use
check=True
It'll throw a crashing error if the process fails
For those times when you need to execute another process
Code
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It pulls the output from STDOUT into the variable.
There's another way to do this where you don't do the pipe and then pull the values from inside the response variable that is what you should probably move to since it gives you stderr as well
Note from the docs` function for all use cases it can handle. For more advanced use cases, the underlying Popen interface can be used directly.
NOTE: subprocess.run does not work out of the box with pyfakefs
post- write these up with examples of all the different ways to get stuff with STDERR and STDOUT
via: https://stackoverflow.com/questions/89228/how-to-call-an-external-command
2020: Most Basic for after Python 3.5
Code
#!/usr/bin/env python3
# This runs, but doesn't send results back to python,
# If you do this:
# You get something like:
# -rw-r--r-- 1 alans staff 187 Oct 20 20:46 test_credentials.py
# CompletedProcess(args=['ls', '-l'], returncode=0)
# But the line with the list stuff is directly from the
# STDOUT that subprocess did. It's not what was passed
# back to print.
Code
#Prior to Python 3.5
#!/usr/bin/env python2
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# This one is how you run commands that are already assembled
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in ,
# This is for python3
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> = or =. is not , =True in .
: <<| |:////4760517/102401>>:
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:
> is is
() .
:
=
.
, =
is not , .
, --------------------------------------------------------------------------------
--
is
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: :////1456269/---