[New-bugs-announce] [issue31209] MappingProxyType can not be pickled

[Alex Hayes]

New submission from Alex Hayes:

I imagine that this is by design (likely because it can't be implemented) however I wanted to check if this was the case.

Instances of types.MappingProxyType can't be pickled.

For example;

```
import pickle
from types import MappingProxyType
eggs = MappingProxyType(dict(sausage=True))
pickle.dumps(eggs)
```

Raises: TypeError: can't pickle mappingproxy objects

----

Is this the desired behaviour or is it a bug?

----------
components: Library (Lib)
messages: 300284
nosy: Alex Hayes
priority: normal
severity: normal
status: open
title: MappingProxyType can not be pickled
type: behavior
versions: Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue31209>
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