How to use Envoy, Envoy: Python Subprocesses for Humans.
About Envoy
Recently I stumble upon Envoy. Envoy is a wrapper around the subprocess module and
is supposed to humanize subprocess of Python.
Its written by Kenneth Reitz (the author of “Requests: HTTP for Humans“)
Why use Envoy?
It was written to be an easy to use alternative to subprocess.
“Envoy: Python Subprocesses for Humans.”
Install Envoy
Envoy is available from PyPI and can be installed with pip.
Search for the Envoy package via the pip command-line tool.
" envoy - Simple API for running external processes. "
Install Envoy
Import Envoy
Just like with any other Python modules, we have to import them first.
Start your Python interpreter and type “import envoy”
Great, Envoy is imported, now we can start to discover its functions etc.
Envoy Methods and Attributes
After you have imported a module in Python, it’s always good to see what functions
,classes and methods that the module provides. One way of doing that is using
“dir(envoy)”.
Using dir(module)
That will list the names of all functions and variables, that are defined in the
Envoy module.
That will give you an output like this:
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If you want to get one name per line, just run a simple for loop:
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This output shows you one name per line:
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You can also use “help(envoy)” to get the documentation on all the functions.
Envoy Usage
Let’s take a look at the “run” method for Envoy.
envoy.run()
To check the uptime of our machine, we can use the “uptime” command.
Standard Output
To see the output, we add “std_out”:
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Status Code
To get the status code, add “status_code” to your object.
Command
Run a command, get the response:
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Standard Error
To get the standard error, add “std_err”.
History
Get history.
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Envoy Examples
Check for the Chrome process
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In our last example, I make use of multiple commands.
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Get the status code of all commands
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Get the status code + the output of each command
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Envoy has become my main library to handle external command calls.
It was written to be an easy to use alternative to subprocess and the convenience
of envoy.run is really great.
More Reading
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