Pythonアップデート 3.5→3.7 + SSLエラー

Traceback (most recent call last):
File "/opt/mybin/ScrapingMail.py", line 4, in
import pandas as pd
File "/usr/local/lib/python3.7/site-packages/pandas/__init__.py", line 17, in
"Unable to import required dependencies:\n" + "\n".join(missing_dependencies)
ImportError: Unable to import required dependencies:
numpy:

IMPORTANT: PLEASE READ THIS FOR ADVICE ON HOW TO SOLVE THIS ISSUE!

Importing the numpy c-extensions failed.

• Try uninstalling and reinstalling numpy.
• If you have already done that, then:

1. Check that you expected to use Python3.7 from "/usr/local/bin/python3",
and that you have no directories in your PATH or PYTHONPATH that can
interfere with the Python and numpy version "1.17.2" you're trying to use.
2. If (1) looks fine, you can open a new issue at
https://github.com/numpy/numpy/issues. Please include details on:
- how you installed Python
- how you installed numpy
- your operating system
- whether or not you have multiple versions of Python installed
- if you built from source, your compiler versions and ideally a build log

• If you're working with a numpy git repository, try `git clean -xdf`

(removes all files not under version control) and rebuild numpy.

Note: this error has many possible causes, so please don't comment on
an existing issue about this - open a new one instead.

Original error was: libf77blas.so.3: cannot open shared object file: No such file or directory

Raspberry PiのPythonがうまく動かないものがあったので
・・・アップデートを試してねというエラーが出る。
そして、アップデートを試みた際の作業メモ。

作業方法自体は、こちらを参考にさせていただきました。

okashimoze.jp

でも、うまくpip3が動かなくなると・・・。

www.unknownengineer.net

こちらも参考にしたら、解決なのかなぁ・・・・。解決しました！（2019/09/08）