Michi Mutsuzaki created THRIFT-3388:
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Summary: hash doesn't work on set/list
Key: THRIFT-3388
URL: https://issues.apache.org/jira/browse/THRIFT-3388
Project: Thrift
Issue Type: Bug
Components: Python - Compiler
Affects Versions: 0.9.3
Environment: ubuntu 14.04 python 2.6.9
Reporter: Michi Mutsuzaki
THRIFT-2621 added hash function to thrift generated classes, but certain types
like set or list cannot be hashed. One solution is to convert them to immutable
types (fronzenset, tuple) before calling hash() on them.
{noformat}
$ thrift -version
Thrift version 0.9.3
$ cat test.thrift
struct Test {
1: required set<string> test
}
$ thrift --gen py -out . test.thrift
$ cat test.py
from test.ttypes import Test
from thrift.protocol import TBinaryProtocol
from thrift.transport import TTransport
# serialize
t = Test(test=set(["a"]))
tout = TTransport.TMemoryBuffer()
pout = TBinaryProtocol.TBinaryProtocol(tout)
t.write(pout)
# deserialize
tin = TTransport.TMemoryBuffer(tout.getvalue())
pin = TBinaryProtocol.TBinaryProtocol(tin)
t2 = Test()
t2.read(pin)
# put the deserialized object to a set
a = set([t2])
$ python test.py
Traceback (most recent call last):
File "test.py", line 18, in <module>
a = set([t2])
File "/tmp/test/test/ttypes.py", line 81, in __hash__
value = (value * 31) ^ hash(self.test)
TypeError: unhashable type: 'set'
{noformat}
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