Why is pip Installation Failing on Python < 3.6 and How Can I Fix It?

Installing pip in Python < 3.6

A common error occurs when attempting to install pip using the steps below in bitbucket CI:

script:
    - apt-get update
    - apt-get install -y python-dev
    - curl -O https://bootstrap.pypa.io/get-pip.py
    - python get-pip.py
    ... and a few more steps

The error manifests as:

Traceback (most recent call last):
  File "get-pip.py", line 24226, in <module>
    main()
  File "get-pip.py", line 199, in main
    bootstrap(tmpdir=tmpdir)
  File "get-pip.py", line 82, in bootstrap
    from pip._internal.cli.main import main as pip_entry_point
  File "/tmp/tmpUgc5ng/pip.zip/pip/_internal/cli/main.py", line 60
    sys.stderr.write(f"ERROR: {exc}")
SyntaxError: invalid syntax<h3 id="Why-is-it-Failing">Why is it Failing?</h3>
</h2>
<p>The error is related to the discontinuation of pip 21.0 support for Python 2 and 3.5. Newer pip versions require Python 3.6 .</p>
<h3 id="How-to-Resolve-the-Issue">How to Resolve the Issue</h3>
<p>To install pip for the specific Python versions:</p>
<ul>
<li>
<p>Python 2.7: Install from https://bootstrap.pypa.io/pip/2.7/</p>
<pre class="brush:php;toolbar:false">curl -O https://bootstrap.pypa.io/pip/2.7/get-pip.py
python get-pip.py
python -m pip install --upgrade "pip < 21.0"

Python 3.6: Install from https://bootstrap.pypa.io/pip/3.6/

Python 3.5: Install from https://bootstrap.pypa.io/pip/3.5/

Python 3.4: Install from https://bootstrap.pypa.io/pip/3.4/

python -m pip install --upgrade "pip < 19.2"

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