pip install が実行できない

Question

pip install selenium

上記のコマンドを入力した際，以下のエラーが発生しました．どのようにすれば解決すれば良いのか教えていただけると幸いです.

Collecting selenium
  Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLError("bad handshake: SysCallError(-1, 'Unexpected EOF')"))': /simple/selenium/
  Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLError("bad handshake: SysCallError(-1, 'Unexpected EOF')"))': /simple/selenium/
  Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLError("bad handshake: SysCallError(-1, 'Unexpected EOF')"))': /simple/selenium/
  Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLError("bad handshake: SysCallError(-1, 'Unexpected EOF')"))': /simple/selenium/
  Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLError("bad handshake: SysCallError(-1, 'Unexpected EOF')"))': /simple/selenium/
  Could not fetch URL https://pypi.org/simple/selenium/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/selenium/ (Caused by SSLError(SSLError("bad handshake: SysCallError(-1, 'Unexpected EOF')"))) - skipping
  Could not find a version that satisfies the requirement selenium (from versions: )
No matching distribution found for selenium
Could not fetch URL https://pypi.org/simple/pip/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/pip/ (Caused by SSLError(SSLError("bad handshake: SysCallError(-1, 'Unexpected EOF')"))) - skipping

なお，pythonのバージョンは以下のようなものです.

Python 3.7.0 (default, Jun 28 2018, 07:39:16) 
[Clang 4.0.1 (tags/RELEASE_401/final)] :: Anaconda, Inc. on darwin

Answer 1

pip のバージョン更新で直ることがあるようです。

参考：

• pipが動作しないエラーの解決

https://qiita.com/agajo/items/73d6f14855da703972e0

• Could not find a version that satisfies the requirement selenium; No matching distribution found for selenium while installing Selenium on Python3.6.5

https://stackoverflow.com/questions/53702565/could-not-find-a-version-that-satisfies-the-requirement-selenium-no-matching-di