TypeError can't concat memoryview to bytearray #303
Description
Attempting to run pip on Jython 2.7.1, I run into the error reported in pypa/pip#5296.
Traceback points at msgpack as the culprit. Here's the tail of it:
File "/usr/local/Cellar/jython/2.7.1/libexec/Lib/site-packages/pip/_vendor/requests/sessions.py", line 618, in send
r = adapter.send(request, **kwargs)
File "/usr/local/Cellar/jython/2.7.1/libexec/Lib/site-packages/pip/_vendor/cachecontrol/adapter.py", line 42, in send
cached_response = self.controller.cached_request(request)
File "/usr/local/Cellar/jython/2.7.1/libexec/Lib/site-packages/pip/_vendor/cachecontrol/adapter.py", line 42, in send
cached_response = self.controller.cached_request(request)
File "/usr/local/Cellar/jython/2.7.1/libexec/Lib/site-packages/pip/_vendor/cachecontrol/controller.py", line 137, in cached_request
resp = self.serializer.loads(request, cache_data)
File "/usr/local/Cellar/jython/2.7.1/libexec/Lib/site-packages/pip/_vendor/cachecontrol/serialize.py", line 98, in loads
return getattr(self, "_loads_v{0}".format(ver))(request, data)
File "/usr/local/Cellar/jython/2.7.1/libexec/Lib/site-packages/pip/_vendor/cachecontrol/serialize.py", line 98, in loads
return getattr(self, "_loads_v{0}".format(ver))(request, data)
File "/usr/local/Cellar/jython/2.7.1/libexec/Lib/site-packages/pip/_vendor/cachecontrol/serialize.py", line 190, in _loads_v4
cached = msgpack.loads(data, encoding='utf-8')
File "/usr/local/Cellar/jython/2.7.1/libexec/Lib/site-packages/pip/_vendor/cachecontrol/serialize.py", line 190, in _loads_v4
cached = msgpack.loads(data, encoding='utf-8')
File "/usr/local/Cellar/jython/2.7.1/libexec/Lib/site-packages/pip/_vendor/msgpack/fallback.py", line 119, in unpackb
unpacker.feed(packed)
File "/usr/local/Cellar/jython/2.7.1/libexec/Lib/site-packages/pip/_vendor/msgpack/fallback.py", line 298, in feed
self._buffer += view
TypeError: can't concat memoryview to bytearray
It would be nice to see this fixed, as jython is hobbled without a working pip.