imp was actually still available up until Python 3.9 or so. Ripping
it out made me go through the headache of debugging our import logic.
Granted, it was deprecated long ago and there was plenty of warning, but
since we are doing the migration now it's all hitting at once if we want
to support any semi-modern Python.
Most notably, these tweaks were needed to fix ./mach build faster.
Also chose to set NSDISTMODE=copy by default for Windows, since
wildcards will be symlinks otherwise. This will always fail
because our binaries have the symlinked MSVC DLLs in their import
tables, and Windows loader silently fails in this situation.
In decorators.py, the original logic fails because cls.__init__ is now a
function instead of a method in Python 3.
In string_version.py, the issue is that str.__init__(self, args) is no longer a
valid way of referencing the parent class of the function, the no-argument
super() can do that in Python 3 properly by using the __class__ cell variable.
Ref: PEP 3135
https://peps.python.org/pep-3135/
The bytestrings seem to break the build system. Also, get_hex is no longer a
thing, those two basestrings can become str (had to check), and
also noticed load_settings was ignoring its own argument.
Ref: BZ 1473498, BZ 1739556
https://hg-edge.mozilla.org/mozilla-central/rev/fa5e23975029
2to3 . --fix input -wpn
2to3 . --fix raw_input -wpn
Py2 input is the new Py3 input wrapped in eval tags.
The new input is the old raw_input.
This lets you have the old behavior. Mechanical.
Ref: PEP 3111
https://peps.python.org/pep-3111/
2to3 . --fix raise -wpn
Python 3 raise syntax is different. Three-argument raise is
deprecated, much like print syntax is changed.
This lets you have the old behavior. Mechanical.
Ref: PEP 3109
https://peps.python.org/pep-3109/
2to3 . --fix dict -wpn
Py2 dict was a list by default, the iterator versions
were switched around to be the default.
This lets you have the old behavior. Mechanical.
Ref: PEP 3106
https://peps.python.org/pep-3106/
Jeremy Andrews
trav90
Matt A. Tobin