[MacPorts] #67347: asciidoc @10.2.0_2: Portfile declares one variable but uses a different one

[MacPorts]

#67347: asciidoc @10.2.0_2: Portfile declares one variable but uses a different one
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  Reporter:  ballapete  |      Owner:  neverpanic
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.8.1
Resolution:             |   Keywords:  tiger ppc
      Port:  asciidoc   |
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Comment (by ballapete):

 Replying to [comment:1 ryandesign]:
 > `python.version`, `python.versions`, and `python.default_version` are
 all valid option names in the python portgroup.
 >
 That's obvious. Otherwise this `Portfile` would not have been put into
 production. The question is why two variables are set to a value that
 corresponds to a Python version and then a third one is used that is set
 by the "system"? In other words: `python.versions` should be
 `python.version` without final "s".

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Ticket URL: <https://trac.macports.org/ticket/67347#comment:2>
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