Why Does Pip Installation Fail in Python Versions Below 3.6?

pip Installation Failure in Python < 3.6

Using the following steps to deploy an application through Bitbucket CI fails to install pip in Python < 3.6:

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

The error encountered is:

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<p><strong>Cause:</strong></p>
<p>Pip 21.0 onwards requires Python 3.6 or higher due to the introduction of syntax features not supported in earlier versions, including Python 2 and 3.5.</p>
<p><strong>Resolution:</strong></p>
<p>To install pip for Python versions < 3.6:</p>
<p><strong>Python 2.7:</strong></p>
<ul>
<li>Download pip from https://bootstrap.pypa.io/pip/2.7/get-pip.py</li>
<li>
<p>Install:</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:

• Download pip from https://bootstrap.pypa.io/pip/3.6/

Python 3.5:

• Download pip from https://bootstrap.pypa.io/pip/3.5/

Python 3.4:

• Download pip from https://bootstrap.pypa.io/pip/3.4/

• Upgrade with:

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

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