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        "description": "ptracer -- a library for ptrace-based tracing of Python programs\n================================================================\n\n.. image:: https://travis-ci.org/pinterest/ptracer.svg?branch=master\n    :target: https://travis-ci.org/pinterest/ptracer\n\nPtracer is a library providing on-demand system call tracing in Python\nprograms.\n\n\nBasic Usage\n-----------\n\n.. code-block:: python\n\n    import traceback\n    import ptracer\n\n    def callback(syscall):\n        print('{}({}) -> {}'.format(\n            syscall.name,\n            ', '.join(repr(arg.value) for arg in syscall.args),\n            syscall.result.text))\n        print('Traceback: ')\n        print(''.join(traceback.format_list(syscall.traceback)))\n\n    with ptracer.context(callback):\n        open('/dev/null', 'wb')\n\n\nFiltering\n---------\n\nPtracer allows elaborate syscall filtering via the *filter* argument:\n\n.. code-block:: python\n\n    flt = [\n        ptracer.SysCallPattern(\n            name='open',\n            args=[\n                re.compile(b'/tmp/.*'),\n                lambda arg: arg.value & os.O_WRONLY\n            ],\n            result=lambda res: res.value > 0\n        )\n    ]\n\n    with ptracer.context(callback, filter=flt):\n        # traced code\n        ...\n\n\nIn the above example, ptracer will invoke the callback only for successful\nattempts to open files in the \"/tmp\" directory for writing.\n\n\nDocumentation\n-------------\n\nThe documentation is available on\n`ptracer.readthedocs.io <https://ptracer.readthedocs.io/>`_.\n",
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