[MacPorts] #57771: py-blaze: add py37 subport

[MacPorts]

#57771: py-blaze: add py37 subport
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 Reporter:  petrrr       |      Owner:  stromnov
     Type:  enhancement  |     Status:  assigned
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  py-blaze
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 If possible please add the py37 subport.

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Ticket URL: <https://trac.macports.org/ticket/57771>
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