IndentationError with python 3.9

[tilmantroester]

Some of the generated python wrapper code causes IndentationError with python 3.9. The same code works on 3.8.

_pyhmcode.f90wrap_halomod__set__dmonly_neutrino_halo_mass_correction(self._handle, \
    ^
IndentationError: expected an indented block

The offending block is

@dmonly_neutrino_halo_mass_correction.setter
    def dmonly_neutrino_halo_mass_correction(self, \
        dmonly_neutrino_halo_mass_correction):
        \
            _pyhmcode.f90wrap_halomod__set__dmonly_neutrino_halo_mass_correction(self._handle, \
            dmonly_neutrino_halo_mass_correction)

Python 3.9 doesn't seem to like the empty line continuation. The following works on 3.8 but fails on 3.9:

def f():
    \
    pass

I can't see anything in the 3.9 change log that mentions this though.

[jameskermode]

Thanks for reporting. I guess we don't need the \ here in any case since the continuation is not needed within parenthesis. A PR to improve the logic would be most welcome, or I will probably get to it eventually.

[tilmantroester]

Thanks for the quick reply. Where would I have to look to fix this?

[jameskermode]

https://github.com/jameskermode/f90wrap/blob/master/f90wrap/codegen.py#L111

could also just allow a larger max_length to be passed in from the command line.

[jameskermode]

Ha. In fact the latter idea is already possible with --py-max-line-length command line option to f90wrap, which might solve your problem?

https://github.com/jameskermode/f90wrap/blob/master/scripts/f90wrap#L157

[tilmantroester]

Setting --py-max-line-length=200 indeed solves this, thanks! I think I also fixed offending part of the line-splitting code (see #154).