Python 2 -> 3 part 1

[iljah]

Few changes to support python 3. Supercedes #1745. Works with python 2.7.15 in fedora 29.

[iljah]

Not sure if I should remove check for python 3 in 7c66577 before everything works

[g1itch]

Not sure if I should remove check for python 3 in 7c66577 before everything works

You shouldn't. Again, please read #1712.

[g1itch]

Maybe you begin with some tests? Separate TestConfig from TestProcessConfig like I did here: d947e70 because the later wont work before complete port to python3 (it uses subprocess to call pybitmessage -t) and write more, e.g. 9808968.

It looks like in python3 you can reuse defaults from BMConfigDefaults and then getint(), getboolean() will act in the same way as safeGetInt() and safeGetBoolean() in current code.

Porting BMConfigParser() is the next big thing in python3 porting process, so I'd suggest to separate related changes in dedicated branch. You may also mock BMConfigParser() and write tests and changes for some other parts of code.

[g1itch]

Notice the required checks

[iljah]

Maybe you begin with some tests?

Could work. I've started that in https://github.com/iljah/PyBitmessage/tree/py3-tests1 and once I get bit further I'll submit another pull request.

[iljah]

After #1749 I start hitting errors that are fixed by stuff here so I guess I'll wait until this is merged until continuing work on above test fixes