use isinstance instead of type
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@ -477,7 +477,7 @@ def yesno(value, yes, no):
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@app.template_filter('canread')
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@app.template_test('canread')
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def canread(ext):
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if type(ext) == db.Data:
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if isinstance(ext, db.Data):
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ext = ext.format
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return ext.lower() in READER_EXTENSIONS
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