Installing pip is not working in python < 3.6

Question

I am trying to use these steps with bitbucket CI to deploy an application:

 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

However, the python get-pip.py step fails with this error:

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

Why isn't it working now? Does it depend on the operating system?

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_{For the equivalent issue with upgrading pip in old Python installations, see Upgrading pip fails with syntax error caused by sys.stderr.write(f"ERROR: {exc}").}

Answer 1

pip 21.0 dropped support for Python 2 and 3.5. The later versions require Python 3.6+. The syntax f"" is supported by Python 3.6+.

To install pip for Python 2.7 install it from https://bootstrap.pypa.io/pip/2.7/ :

- curl -O https://bootstrap.pypa.io/pip/2.7/get-pip.py
- python get-pip.py
- python -m pip install --upgrade "pip < 21.0"

The last command is to upgrade to the latest supported version.

• For Python 2.7 the latest supported is currently pip 20.3.4.
• For Python 3.6 install from https://bootstrap.pypa.io/pip/3.6/
• For Python 3.5 install from https://bootstrap.pypa.io/pip/3.5/
• For Python 3.4 install from https://bootstrap.pypa.io/pip/3.4/
• For Python 3.4 the upgrade command is

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

Answer 2

I solved it by firstly run

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

and then

python -m pip install --upgrade "pip < 21.0".

It seems reinstall my pip 20.3.4 and the error disappreared!

Answer 3

This worked for me:On Mac:

Install pyenv as well as upgrade your python following the instructions on this here

Then in your terminal, if you run python -V and you still get the old version(system predefined version) showing:

To resolve this:

In your terminal run: alias python=python3

Then in your terminal execute python and you should now see that your system is using the python version you installed-:That is if you followed and completed the steps Here Correctly.

Restart your terminal(close/reopen):

Now you can finally install pip:

Read more about pip instalation steps [here][3]

1:In your terminal execute :$ python -m ensurepip --upgrade

2: Download the script, from https://bootstrap.pypa.io/get-pip.py.

But..**NB**: instead of navigating to the exact link provided,check out the available versions of pip here: pipversions

Select the latest version:

Then select getpip.py link to get the file and save it into your directory on your machine:

cd into the folder where you saved the newly downloaded script and execute:

Then execute:

python get-pip.py

Pip installed successfully:

Answer 4

For me python 3.5 on aws ec2 below worked curl -O https://bootstrap.pypa.io/pip/3.5/get-pip.py

Then sudo python3.5 get-pip.pyenter image description here

Answer 5

I have also tried all thing but my solution was download old get-pip version and install.

1. download: curl -O https://bootstrap.pypa.io/2.7/get-pip.py the file get-pip.py
2. install: python get-pip.py or python2 get-pip.py
3. enjoy

This is worked on Debian systems.

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Edit: A better solution is always to install a Python version that is long supported. If at all you need to work with an older version - only then must one resort to the above workaround.

Answer 6

1. Uninstall existing pip on your machine

2. Run this cmd in ubuntu or any linux machine

   curl https://bootstrap.pypa.io/pip/3.5/get-pip.py -o get-pip.py
   python3 get-pip.py
   

It will work