op_imports.get_opcode_module raises KeyError on Python 3.8.5

[rocky]

op_imports.get_opcode_module raises KeyError on Python 3.8.5

[SuperStormer]

This should be easily fixable by changing these lines:

vers_str = '.'.join([str(v) for v in version_info[0:3]])
    if len(version_info) >= 3 and version_info[3] != 'final':
        vers_str += ''.join([str(v) for v in version_info[3:]])

to:

vers_str = '.'.join([str(v) for v in version_info[0:2]])

I'm not quite sure why this function is checking the micro release version in the first place; the op_imports dict should only need the major and minor release versions.

[rocky]

The version additions were fixed in 4bf7005

As for listing what exists, that's because this is to document what exists (excluding most beta and candidate releases).

And also Python being Python, magic numbers have switched mid version.

That said, there probably should be some sort of loose check version of get_opcode_module() or a parameter that loosens things. Feel free to put in a PR for that and we can discuss/review.