Argument byte v string typing when generating weblogo in scons

[aflaus]

Error when running SConstruct after successful dependencies check in Ubuntu 20.04 beta.

scons: *** [figs/seqlogo_H2A_cds.pdf] TypeError : starts with first arg must be bytes or a tuple of bytes, not str

This is presumably because an input file is being opened as binary by default in python3. Not sure where problem is in code but should be easy to set the type correctly.
https://stackoverflow.com/questions/19827615/startswith-typeerror-in-function/

[aflaus]

OK, I solved this. On line 144 of init.py it is necessary to add the option "text=True" to subprocess.check_output.

However, this probably creates a dependency for python 3.7 or greater
https://docs.python.org/3/library/subprocess.html#using-the-subprocess-module