py3: convert `'{}'.format(foo)` to `'%s' % foo` in the bookflow extension

Authored by mharbison72.

Description

py3: convert '{}'.format(foo) to '%s' % foo in the bookflow extension

Byte strings don't have the former. Converting these to byte strings is waiting
on the mass rewrite.

Details

Committed
mharbison72Dec 20 2018, 11:16 PM
Parents
rHGc0865f3da285: py3: byteify sys.argv in gendoc.py
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