Compatibility issue with cx_Freeze with Python 2.7

[PierreRaybaut]

Currently, jsonschema breaks any attempt to deploy a Python script using cx_Freeze, a common tool for deploying self-consistent Python applications, (not only, but for example) on Windows platforms.

The source of the problem is in jsonschema/compat.py:

try:
    from collections import MutableMapping, Sequence  # noqa
except ImportError:
    from collections.abc import MutableMapping, Sequence  # noqa

When commenting those lines, cx_Freeze works as expected.

The fact is jsonschema is part of the huge dependency list of IPython. IPython is very invasive when installed: even if not needed by your application, deploying with cx_Freeze will take all IPython related modules with it (and jsonschema is among them).
In other words, building the most insignificant Python script will fail only because IPython is installed (which happens a lot) and it depends on jsonschema.

See PR #264

[Julian]

For anyone finding this: see the discussion on #264, which was a proposed fix (and a probably working one I assume :), for what seems like an upstream issue, but it'd need a test to be mergeable.

[Julian]

It seems like the upstream issue was fixed, so I'm going to close this as "unsupported, but willing to support if the above is addressed."