[MacPorts] #56821: py-flake8: add Python 3.7 support

[MacPorts]

#56821: py-flake8: add Python 3.7 support
--------------------------+----------------------
  Reporter:  mohd-akram   |      Owner:  petrrr
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  py-flake8    |
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Comment (by Peter Danecek <peter.danecek@…>):

 In [changeset:"a6e67a2e833bf1642b551a5c4a3891262e8396b1/macports-ports"
 a6e67a2e833bf1642b551a5c4a3891262e8396b1/macports-ports] (master):
 {{{
 #!ConfigurableCommitTicketReference repository="macports-ports"
 revision="a6e67a2e833bf1642b551a5c4a3891262e8396b1"
 py-pyflakes: add py37 subport

 See: https://trac.macports.org/ticket/56821
 }}}

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Ticket URL: <https://trac.macports.org/ticket/56821#comment:2>
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