Peter Otten added the comment:
I believe you are misinterpreting what you are seeing. Empty lines read from a
file do not produce an empty string, you get "\n" instead which is true in a
boolean context.
Try
[line.split()[0] for line in lines if line.strip() and not line.startswith("#")]
or add an extra check for all-whitespace line
[... if line and not line.isspace() and not line.startswith("#")]
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nosy: +peter.otten
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<http://bugs.python.org/issue19657>
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