[MacPorts] #59789: explicit execution of pip3.7 results in pip from python 2.7

[MacPorts]

#59789: explicit execution of pip3.7 results in pip from python 2.7
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 Reporter:  duaneellissd             |      Owner:  (none)
     Type:  defect                   |     Status:  new
 Priority:  Normal                   |  Milestone:
Component:  ports                    |    Version:  2.6.2
 Keywords:  python3.7 pip3.7 pip2.7  |       Port:
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 I am new to Macports, but very familiar with python on linux etc.

 I have a new Mac (Catalina) purchased Nov 2019 (with a real Escape key!)

 Installed: "Mac ports" -  (new install on Dec 1 2019)

 Then tried to install some packages in the system provided "python3.7" via
 pip.

 At the command line if I type:   "pip3.7 install PACKAGE" - I would expect
 to have the package installed in Python 3.7 as provided and came with my
 Mac, or at least the Python3.7 version that comes with MacPorts

 Instead - it redirects to Python2.7

 For example:   'pip3.7 install roku' - actually installs the 2.7 version.

 'python3.7 -m pip install roku' works and installs the package into Python
 3.7

 Example command output:
 {{{
 duane at Duanes-MacBook-Pro ~ %
 duane at Duanes-MacBook-Pro ~ %
 duane at Duanes-MacBook-Pro ~ % which pip3.7
 /usr/local/bin/pip3.7
 duane at Duanes-MacBook-Pro ~ % pip3.7 -V
 pip 19.3.1 from /Library/Python/2.7/site-packages/pip-19.3.1-py2.7.egg/pip
 (python 2.7)
 duane at Duanes-MacBook-Pro ~ %
 duane at Duanes-MacBook-Pro ~ % python3 -m pip -V
 pip 19.0.3 from
 /Applications/Xcode.app/Contents/Developer/Library/Frameworks/Python3.framework/Versions/3.7/lib/python3.7
 /site-packages/pip (python 3.7)
 }}}

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Ticket URL: <https://trac.macports.org/ticket/59789>
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