Kim van der Riet created PROTON-1835:
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Summary: [Python binding] Use of Python dict for AMQP maps does
not allow derived or related keys of the same value
Key: PROTON-1835
URL: https://issues.apache.org/jira/browse/PROTON-1835
Project: Qpid Proton
Issue Type: Bug
Components: python-binding
Reporter: Kim van der Riet
The AMQP map (expressed as a list) {{[binary(123), "hello", decimal128(123),
"world"]}} cannot be implemented in Python using the {{dict}} type. This
happens because {{proton.decimal}} is derived from {{bytes}}, and the
dictionary treats them as the same value and causes the first value to be
overwritten by the second:
{noformat}
>>> import proton
>>> {b'123': 'hello', proton.decimal128(b'123'): 'world'}
{'123': 'world'}
{noformat}
Using the [] operator to add the values one at a time to an empty {{dict}}
results in the same outcome. Even using related classes (ie both derived from a
common parent) don't work:
{noformat}
>>> import proton
>>> class mybin(bytes):
... def __repr__(self):
... return 'mybin(%s)' % bytes.__repr__(self)
...
>>> {mybin(b'123'): 'hello', proton.decimal128(b'123'): 'world'}
{mybin('123'): 'world'}
{noformat}
This issue highlights that the Python {{dict}} type is not suitable for
representing AMQP maps. In addition, {{dict}}s do not guarantee ordering of the
elements (although other Python classes such as {{collections.OrderedDict}}
do). Solving this issue will probably require re-implementing the way AMQP maps
are represented.
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