Why not go for f-strings (Python 3.6+). See for instance:

http://zetcode.com/python/fstring/

The code:

def __repr__(self):
    # Better for g.printObj.
    val = str(self.val).replace('\n', ' ')
    return 'GS: %20s %7s = %s' % (
        g.shortFileName(self.path), self.kind, g.truncate(val, 50))

would look as follows:

def __repr__(self):
    # Better for g.printObj.
    val = (str(self.val).replace('\n', ' '))[0:50] # Save call to g.truncate
    return f'GS: {g.shortFileName(self.path):20} {self.kind:7} = {val}'

Less typing, Smaller, faster, cleaner.

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