unsupported operand type(s) for %: 'NoneType' and 'tuple'

[Xavier Ho]

Hi Victor,

the .append function doesn't return anything, so it's a None. And you should
have it inside the parentheses.

>>> tree.append("%s%s" % ("\t" * level, name))

is probably what you're after.

Cheers,
Xav
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