[raspbian] How To Install Python-3.6.11

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Environment
  raspbian: jessie
  Linux phome 4.9.35-v7+ #1014 SMP

Goal:
  To setup Jupyter Notebook.
  (needed pip3 18.1. (It required Python 3.5 but mine is 3.4.2)

Conclusion:
  - Python-3.6.11 : OK
  - Python-3.8.3
     make : OK, but pip cannot connect TLS/SSL
      (https://stackoverflow.com/questions/62827291/warning-pip-is-configured-with-locations-that-require-tls-ssl-however-the-ssl)
     I think that it occurred by the difference of  openssl versions.
     (But I did not to try figure out)
   - Python-3.7.4 : Same problem like 3.8.3.
   - Python-3.5.9 : Compile error by gcov dependency.

Method:
  - Download 3.6.11 source and compile.
  - Type "make altinstall"
  - Make file links with "update-alternatives" command.

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