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Subprocesses for Humans 2.0.
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amitt001/delegator.py
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Delegator.py is a simple library for dealing with subprocesses, inspiredby bothenvoy andpexpect (in fact, it depends on it!).
This module features two main functionsdelegator.run() anddelegator.chain(). One runs commands, blocking or non-blocking, and the other runs a chain of commands, separated by the standard unix pipe operator:|.
Basic run functionality:
>>> c= delegator.run('ls')>>>print c.outREADME.rst delegator.py>>> c= delegator.run('long-running-process',block=False)>>> c.pid35199>>> c.block()>>> c.return_code0
Commands can be passed in as lists as well (e.g.['ls', '-lrt']), for parameterization.
Basic chain functionality:
# Can also be called with ([['fortune'], ['cowsay']]).# or, delegator.run('fortune').pipe('cowsay')>>> c= delegator.chain('fortune | cowsay')>>>print c.out _______________________________________ / Our swords shall play the orators for \ | us. | | | \ -- Christopher Marlowe / --------------------------------------- \ ^__^ \ (oo)\_______ (__)\ )\/\ ||----w | || ||Expect functionality is built-in too, on non-blocking commands:
>>> c.expect('Password:')>>> c.send('PASSWORD')>>> c.block()
Other functions:
>>> c.kill()>>> c.send('SIGTERM',signal=True)# Only available when block=True, otherwise, use c.out.>>> c.err''# Direct access to pipes.>>> c.std_err<open file '<fdopen>', mode 'rU' at 0x10a5351e0># Adjust environment variables for the command (existing will be overwritten).>>> c= delegator.chain('env | grep NEWENV',env={'NEWENV':'FOO_BAR'})>>> c.outNEWENV=FOO_BAR
$ pip install delegator.py
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