default should be an iterable
The code looks at `fmt` as an iterable. Tweak the default value to avoid iteration of 'p', 'd', 'f'.
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@ -211,7 +211,7 @@ class Harness:
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return dot
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def output(self, filename, directory='_output', view=False, cleanup=True, fmt='pdf', gen_bom=False):
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def output(self, filename, directory='_output', view=False, cleanup=True, fmt=('pdf',), gen_bom=False):
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# graphical output
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graph = self.create_graph()
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for f in fmt:
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