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        "description": "# duct.py [![Actions Status](https://github.com/oconnor663/duct.py/workflows/tests/badge.svg)](https://github.com/oconnor663/duct.py/actions) [![Coverage Status](https://coveralls.io/repos/oconnor663/duct.py/badge.svg?branch=master&service=github)](https://coveralls.io/github/oconnor663/duct.py?branch=master) [![PyPI version](https://badge.fury.io/py/duct.svg)](https://pypi.python.org/pypi/duct) [![Documentation Status](https://readthedocs.org/projects/ductpy/badge/?version=latest)](https://ductpy.readthedocs.io/en/latest/?badge=latest)\n\nDuct is a library for running child processes. Duct makes it easy to\nbuild pipelines and redirect IO like a shell. At the same time, Duct\nhelps you write correct, portable code: whitespace is never significant,\nerrors from child processes get reported by default, and a variety of\n[gotchas, bugs, and platform\ninconsistencies](https://github.com/oconnor663/duct.py/blob/master/gotchas.md)\nare handled for you the Right Way\u2122.\n\n- [Documentation](https://ductpy.readthedocs.io)\n- [PyPI package](https://pypi.python.org/pypi/duct)\n- [the same library, in Rust](https://github.com/oconnor663/duct.rs)\n\nExamples\n--------\n\nRun a command without capturing any output. Here \"hi\" is printed directly to\nthe terminal:\n\n```python\n>>> from duct import cmd\n>>> cmd(\"echo\", \"hi\").run()\nhi\nOutput(status=0, stdout=None, stderr=None)\n```\n\nCapture the standard output of a command. Here \"hi\" is returned as a string:\n\n```python\n>>> cmd(\"echo\", \"hi\").read()\n'hi'\n```\n\nCapture the standard output of a pipeline:\n\n```python\n>>> cmd(\"echo\", \"hi\").pipe(cmd(\"sed\", \"s/i/o/\")).read()\n'ho'\n```\n\nMerge standard error into standard output and read both incrementally:\n\n```python\n>>> big_cmd = cmd(\"bash\", \"-c\", \"echo out && echo err 1>&2\")\n>>> reader = big_cmd.stderr_to_stdout().reader()\n>>> with reader:\n...     reader.readlines()\n[b'out\\n', b'err\\n']\n```\n\nChildren that exit with a non-zero status raise an exception by default:\n\n```python\n>>> cmd(\"false\").run()\nTraceback (most recent call last):\n...\nduct.StatusError: Expression cmd('false') returned non-zero exit status: Output(status=1, stdout=None, stderr=None)\n>>> cmd(\"false\").unchecked().run()\nOutput(status=1, stdout=None, stderr=None)\n```",
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