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A shell-like DSL front for subprocess.Popen

Project Description

popen

What is it?

The popen package provides a simple shell-like syntax inside python for running external commands.

Features:

  • Chaining (aka. piping) as Sh('ls') | 'sort'
  • Redirect stderr to stdout as Sh('make').include_stderr | 'wc'
  • Redirect output to file as Sh('ls') > '~/listing.txt'
  • Iteration over output lines as for line in Sh('ls'):
  • Streaming input into commands in the chain as Sh.pipe('~/listing.txt').Sh('grep', '-q', 'code').returncode
  • Expands special characters (~*!?)
  • Expands env vars ($HOME) as print Sh('ls', '$USER', '~/*')
  • Properly splits strings ('echo "hole in one"' becomes ['echo', 'hole in one'])
  • Or iterable arguments (Sh('ls', '-l') | ['wc', '-l'] > '/dev/null')

TL;DR

Installation:

pip install popen

Example:

from popen import Sh
for line in Sh('du', '~/') | 'head -n 10' | 'sort -n':
    print('GOT', line)

Usage

Simples usage, run a command and iterate the output lines:

from popen import Sh
for line in Sh('ls', '-la', '~'):
    print line

Piping that output to a file:

Sh('ls', '-la', '~') > '~/listing'

Note that special characters like ~ are expanded, as are environment variables (e.g. $HOME).

Chaining commands is trivial, here with append instead of write to file:

Sh('ls') | Sh('sort') >> '~/listing'

But the right hand side of | can be very flexible, as it employs lexical splitter on string input or takes an iterable:

Sh('ls', '-la', '~') | 'sort -c' | ['uniq', '-c'] | 'tail' | Sh('wc') > '~/listing'

To run a command and let output go to stdout, ask for the return code:

cmd = Sh('ls') | 'grep polka'
print cmd.returncode

To pipe a string into a command, wrap in an iterable:

print Sh.pipe(['this is a \nmulti line\nstring.']) | 'wc'
Release History

Release History

This version
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0.1.20

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0.1.19

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0.1.18

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0.1.17

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0.1.15

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0.1.14

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0.1.13

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0.1.12

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File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
popen-0.1.20.tar.gz (7.0 kB) Copy SHA256 Checksum SHA256 Source Jan 29, 2015

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