Error when writing modified GFF file

[hdbeukel]

I am trying to parse a GFF file, modify it by removing overlapping features, and write the new GFF to a file. I get the following error when trying to write the GFF:

TypeError: a bytes-like object is required, not 'str'

I even get this same error when just parsing a GFF file and writing it to another file, without any modifications in between:

gff = Gff3()
gff.parse("path/to/my.gff3")
gff.write("path/to/output.gff3")

When looking in the source code, I noticed that you are reading the GFF file with mode "r" but writing with mode "wb". Could this be the reason why I get this error?