For New versions

Older versions of python may not have pip installed and get-pip will throw errors. Please update your python (2.7.15 as of Aug 12, 2018).

All current versions have an option to install pip and add it to the path.

Steps:

1. Open Powershell as admin. (win+x then a)
2. Type python -m pip install <package>.

If python is not in PATH, it'll throw an error saying unrecognized cmd. To fix, simply add it to the path as mentioned below[1].

[OLD Answer]

Python 2.7 must be having pip pre-installed.

Try installing your package by:

1. Open cmd as admin. (win+x then a)
2. Go to scripts folder: C:\Python27\Scripts
3. Type pip install "package name" .

Note: Else reinstall python: https://www.python.org/downloads/

[1] Also note: You must be in C:\Python27\Scripts in order to use pip command, Else add it to your path by typing: [Environment]::SetEnvironmentVariable("Path","$env:Path;C:\Python27\;C:\Python27\Scripts\", "User")

pip install --upgrade "pip < 21.0"

Try installing manually:

wget -P ~/.local/lib https://bootstrap.pypa.io/pip/2.7/get-pip.py
python2.7 ~/.local/lib/get-pip.py --user 
#if using bash
printf "\nPATH=\$PATH:~/.local/bin/" >> ~/.bashrc
source ~/.bashrc

If you are using python 2.7.9 or above, pip is already installed. For lower versions of python you can install pip using below steps:

1. Download get-pip.py scripy from here: https://bootstrap.pypa.io/get-pip.py
2. Open the command prompt and navigate to get-pip.py file.
3. Run the command python get-pip.py

After installing, you can check the pip version using python -m pip --version'. If you want to upgrade pip version you can runpython -m pip install --upgrade pip`

The SSL related warning you are getting while installing pip can be overcome by either upgrading to latest version of python 2.7 or following the instructions given here: https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings. These warnings are relevant to you if you are handling some urls in your python script.

As the message says, PyPi has discontinued support for Python <2.7.9 as of May 6th 2021. If you're running a version < 2.7.9 and you cannot upgrade to a newer version of Python then your only option is to manually download the wheels from PyPi.

These are the modification I needed to make to my build script to make it work:

I needed to install software-properties-common and gcc

apt-get install -y software-properties-common gcc

Then I downloaded (setuptools](https://pypi.org/project/setuptools/44.1.1/#files) and unzipped and installed it:

python ./setuptools-44.1.1/setup.py install

Next, I downloaded pip and added it to a folder called wheels. Then I could use the whl file to run pip to get pip

python ./wheels/pip-20.3.4-py2.py3-none-any.whl/pip install --no-index --find-links ./wheels/ pip --ignore-installed

It was suggested to build a Docker container using Ubuntu 16.04 with Python 2.7.17 and use that to download the packages.

pip download -r requirements.txt

But the versions of the packages were wrong, so I ended up going through the requirements.txt and downloading each package manually from PyPi and adding it to the wheels folder. A running instance is useful so you can run pip freeze or look at a requirements.txt file to grab the version numbers of all the packages you need.

Now that I could use pip, I can install my other packages:

python pip install --no-index --find-links ./wheels/ -r /root/requirements.txt

This uncovered some dependencies that I hadn't downloaded packages for yet so I had to go through and download those and added them to the wheels folder. There were a few other things I found needed different versions than I had originally downloaded and a few packages relied on pbr and many more wanted wheel:

pip install --no-index --find-links ./wheels/ pbr==5.5.1 wheel==0.36.2

I also needed to download cMake and add it to the wheels folder

After that I could install my requirements.txt:

pip install --no-index --find-links ./wheels/ -r /root/requirements.txt --ignore-installed

Use virtual environments. They allow you to use isolated python instances with different set of packages. Python 3 comes with venv module that lets you create one using

python -m venv venv
venv\Scripts\activate.bat

When you do this your prompt changes from d:\my_project> to (venv) d:\my_project>, so you know you're inside a virtual environment and every package you install will be isolated to that environment.

To install pip for Python2 on Ubuntu, this worked for me

sudo apt update
curl https://bootstrap.pypa.io/pip/2.7/get-pip.py --output get-pip.py
sudo python2 get-pip.py

It's based on DareDevil7's answer but notice the url is different.

There should be a binary called "pip2.7" installed at some location included within your $PATH variable.

You can find that out by typing

which pip2.7

This should print something like '/usr/local/bin/pip2.7' to your stdout. If it does not print anything like this, it is not installed. In that case, install it by running

$ wget https://bootstrap.pypa.io/pip/2.7/get-pip.py
$ sudo python2.7 get-pip.py

Now, you should be all set, and

which pip2.7

should return the correct output.

I assume on your system default python=2.6, the version you want to install pip for python=2.7 so:

$ python
this is default python

$ python2
python2.7

$ python2 get-pip.py

This guide will show you how to do it (however, has to be updated for python 2.7). These are the necessary steps:

Start by enabling the universe repository:

sudo add-apt-repository universe

Update the packages index:

sudo apt update 

Use curl to download the get-pip.py script (for python 2.7):

sudo curl https://bootstrap.pypa.io/pip/2.7/get-pip.py --output get-pip.py 

Once the repository is enabled, run the script as sudo user with python2 to install pip for Python 2:

sudo python2 get-pip.py

Verify installation by running the following:

pip --version