{
    "info": {
        "author": "Beijing ColorfulClouds Technology Co.,Ltd.",
        "author_email": "admin@caiyunapp.com",
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        "description": "# rb3, the rb fork support Python3.7\n\n## Changes compared to [getsentry/rb](https://github.com/getsentry/rb)\n\n**Not a compatibility upgrade.**\n\nFrom this version, this fork of rb will only support Python3.7+ (Python3.5+ is tested but not recommend).\n\nAt the moment, we focus on how to make rb work under Python3.7 like it workd well on Python2.7.\n\nChange in `crc32`:\n\n- [Python 3 crc32 documentation clarifications](https://bugs.python.org/issue22341)\n- [crc32 Python 3 doc](https://docs.python.org/3/library/binascii.html)\n- [crc32 Python 2 doc](https://docs.python.org/2/library/binascii.html)\n\nFor now, we decide to support Python2-like `crc32` computing result by editing `rb/router.py`:\n\n```python\nclass PartitionRouter(BaseRouter):\n    \"\"\"A straightforward router that just individually routes commands to\n    single nodes based on a simple ``crc32 % node_count`` setup.\n\n    This router requires that the hosts are gapless which means that\n    the IDs for N hosts range from 0 to N-1.\n\n    ``crc32`` returns different value in Python2 and Python3, for details\n    check this link: https://bugs.python.org/issue22341.\n    \"\"\"\n\n    def __init__(self, cluster):\n        BaseRouter.__init__(self, cluster)\n        assert_gapless_hosts(self.cluster.hosts)\n\n    def get_host_for_key(self, key):\n        if isinstance(key, text_type):\n            k = key.encode('utf-8')\n        else:\n            k = bytes_type(key)\n        # Make sure return value same as in Python3\n        # return (crc32(k) & 0xffffffff) % len(self.cluster.hosts)\n\n        # Make sure return value same as in Python2\n        crc_res = crc32(k)\n        crc_res = (crc_res - ((crc_res & 0x80000000) <<1))\n        return crc_res % len(self.cluster.hosts)\n```\n\nBut may turn to use Python 3's native `crc32` function in the future.\n\n## TODO\n\n- [ ] option to choose `crc32`'s method\n- [ ] fix macOS travis test\n- [ ] fix pypy travis test\n\n# rb's original README\n\n![logo](https://github.com/getsentry/rb/blob/master/docs/_static/rb.png?raw=true)\n\nrb - the redis blaster.\n\nThe fastest way to talk to many redis nodes.  Can do routing as well as\nblindly blasting commands to many nodes.  How does it work?\n\nFor full documentation see [rb.rtfd.org](http://rb.rtfd.org/)\n\n## Quickstart\n\nSet up a cluster:\n\n```python\nfrom rb import Cluster\n\ncluster = Cluster({\n    0: {'port': 6379},\n    1: {'port': 6380},\n    2: {'port': 6381},\n    3: {'port': 6382},\n}, host_defaults={\n    'host': '127.0.0.1',\n})\n```\n\nAutomatic routing:\n\n```python\nresults = []\nwith cluster.map() as client:\n    for key in range(100):\n        client.get(key).then(lambda x: results.append(int(x or 0)))\n\nprint('Sum: %s' % sum(results))\n```\n\nFanout:\n\n```python\nwith cluster.fanout(hosts=[0, 1, 2, 3]) as client:\n    infos = client.info()\n```\n\nFanout to all:\n\n```python\nwith cluster.fanout(hosts='all') as client:\n    client.flushdb()\n```",
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