pip エラーの対処法(Upgrade to the latest pip and try again)

0. はじめに

pip3のコマンドを打ったところ、以下のようなエラーが表示された。
ここでは、その対処法を記載する。

=============================DEBUG ASSISTANCE==========================
            If you are seeing an error here please try the following to
            successfully install cryptography:

            Upgrade to the latest pip and try again. This will fix errors for most
            users. See: https://pip.pypa.io/en/stable/installing/#upgrading-pip
            =============================DEBUG ASSISTANCE==========================

    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-build-l92ccydt/cryptography/setup.py", line 14, in <module>
        from setuptools_rust import RustExtension
    ModuleNotFoundError: No module named 'setuptools_rust'

    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-l92ccydt/cryptography/

1. pip をアップグレードする

$sudo rpm -Uvh platform-python-pip-9.0.3-18.el8.n
oarch.rpm python3-pip-9.0.3-18.el8.noarch.rpm
Verifying...                                                            ( 50%################################# [100%]
Preparing...                                                            ( 25%################################# [100%]
Updating / installing...
   1:platform-python-pip-9.0.3-18.el8                                   (  2%################################# [ 25%]
   2:python3-pip-9.0.3-18.el8                                           (  3%################################# [ 50%]
Cleaning up / removing...
   3:python3-pip-9.0.3-15.el8                                           ( 10%################################# [ 75%]
   4:platform-python-pip-9.0.3-15.el8                                   (  2%################################# [100%]

2. python3-cryptography を再インストールする

$ sudo rpm -ivh --replacepkgs python3-cryptography-2.3-3.el8.x86_64.rpm
Verifying...                                                            (100%################################# [100%]
Preparing...                                                            (100%################################# [100%]
Updating / installing...
   1:python3-cryptography-2.3-3.el8                                     (  1%################################# [100%]