instancer: fix invalid operand '-'; dict.keys() returns list in py27
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@ -688,7 +688,7 @@ def normalize(value, triple, avar_mapping):
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def normalizeAxisLimits(varfont, axis_limits):
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fvar = varfont["fvar"]
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bad_limits = axis_limits.keys() - {a.axisTag for a in fvar.axes}
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bad_limits = set(axis_limits.keys()).difference(a.axisTag for a in fvar.axes)
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if bad_limits:
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raise ValueError("Cannot limit: {} not present in fvar".format(bad_limits))
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