* Drop Python versions <3.7.
* Updated README to clarify that Python 3.7 is the minimum.
* Removed more Python 3.5-specific code.
Also changed tests to skip missing interpreters.
* Invoke tox directly instead of through Python.
Hopefully this will pick up python3.
* Updated java_stretch image to bullseye to get Python >= 3.7.
* Use jdk11 instead of jdk8.
* Installed python2 for gtest.
* Use "python3 -m venv" instead of "virtualenv."
* Install python3-venv.
The base class/documentation suggest that the argument
names are `self` and `done`, while the runtime used
argument names `srvc` and `callback`.
`mypy.stubtest` was able to identify this - as it compares
the types (autogenerated by
[`mypy-protobuf`](https://github.com/dropbox/mypy-protobuf/))
to the actual code generated by protoc at runtime.
Since the stubs assume the generated code matches the abstract
interface in service.py - it saw these differences.
The previously used term "3-Clause BSD License" is not properly
standarized. A common standard is SPDX, therefore "3-Clause BSD License"
is substituted with "BSD-3-Clause" which is a SPDX identifier.
`grep -rl "3-Clause BSD License" | xargs -n1 sed -i "s/3-Clause BSD
License/BSD-3-Clause/g"`
* Fixed some reference leaks.
* Fixed a few reference leaks.
* Fixed a few more memory errors.
* Fixed a few more reference leaks.
* Revert minimal_test.py.
* Re-enable limited API.
* Removed some debugging and spurious changes.
* Addressed PR comments.
The Windows build for Python 3.10 is giving us an error about ssize_t
being undefined, so this commit fixes the problem by replacing it with
Py_ssize_t, which is consistent with what we do elsewhere in the file.
The first change is to make sure we always define PY_SSIZE_T_CLEAN
before including Python.h. Starting from Python 3.10 this is required.
Otherwise we get errors like this:
SystemError: PY_SSIZE_T_CLEAN macro must be defined for '#' formats
The second change is to update reflection_test.py to account for the
fact that with Python 3.10, we get a TypeError even with the C++
implementation when trying to assign a float to a bool field. I'm not
sure why this changed with Python 3.10, but it seems like a good thing
since this is the desired behavior anyway.