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https://issues.apache.org/jira/browse/AVRO-1737?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael A. Smith resolved AVRO-1737.
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Fix Version/s: 1.12.0
Release Note: Instances of Schema in Python can be used in sets, as the
keys of dictionaries, and other places where hashable types are needed.
Resolution: Fixed
> Unhashable type: 'RecordSchema'
> -------------------------------
>
> Key: AVRO-1737
> URL: https://issues.apache.org/jira/browse/AVRO-1737
> Project: Apache Avro
> Issue Type: Bug
> Components: python
> Affects Versions: 1.7.7
> Environment: Python 3, avro 1.7.7
> Reporter: Zoltan Fedor
> Assignee: Michael A. Smith
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.12.0
>
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> Following the standard example from
> http://avro.apache.org/docs/current/gettingstartedpython.html but adding a
> dict.get() lookup using an avro.schema.RecordSchema object fails due to
> "unhashable type: 'RecordSchema'"
> This likely happens because the RecordSchema class overwrites the __eq__
> method but does NOT define a __hash__ method.
> Check the Python 3 manual on object.__hash__
> (https://docs.python.org/3.1/reference/datamodel.html?highlight=hash#object.%5F%5Fhash%5F%5F):
> "If a class does not define an __eq__() method it should not define a
> __hash__() operation either; if it defines __eq__() but not __hash__(), its
> instances will not be usable as items in hashable collections."
> TO REPRODUCE the issue run the following script in Python 3 (tested in Python
> 3.4.3):
> {code}
> import avro.schema
> from avro.datafile import DataFileReader, DataFileWriter
> from avro.io import DatumReader, DatumWriter
> schema = avro.schema.Parse(open("users.avsc").read())
> writer = DataFileWriter(open("users.avro", "wb"), DatumWriter(), schema)
> writer.append({"name": "Alyssa", "favorite_number": 256})
> writer.append({"name": "Ben", "favorite_number": 7, "favorite_color": "red"})
> writer.close()
> reader = DataFileReader(open("users.avro", "rb"), DatumReader())
> for user in reader:
> print(user)
> reader.close()
> ### added to generate the error
> test = {}
> test.get(schema, -1)
> {code}
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