Installing Pip-3.2 on Cygwin

Question

I have Python 3 installed on Cygwin. However, I am unable to install Python 3 packages via pip. Is there a way to do this?

Answer 1

I think the alternative install instructions linked by mata are simplest:

To install pip, securely download get-pip.py.

Then run the following (which may require administrator access):

python get-pip.py

Answer 2

If you have more than one python installation, then you need to install pip (and probably also setuptools) for each installation separately.
To do so, you can first download ez_setup.py and run it with python3:

/usr/bin/python3 ez_setup.py

That should install setuptools, and also create an easy_install script for your python version, e.g. /usr/bin/easy_install-3.2, which you can use to install pip:

/usr/bin/easy_install-3.2 pip

This will install pip into your python3 site packages directory, and again create a script /usr/bin/pip-3.2, which you can use to install packages for this python version.

Alternatively you can follow the install instructions from here and here.

Answer 3

1)While installing cygwin, make sure you install the python/python-setuptools from the list. This will install "easy_install" package.

2) Type the following command:

easy_install-a.b pip   

You must replace a.b with your python version which can be 2.7 or 3.4 or whatever else.

Answer 4

Since OP specifically talks about Python3, I think we need to specify that just in case the user already have Python2 installed, which is very likely.

# If you don't have Python3 already, use apt-cyg:
apt-cyg install python3

# First update pip, pip2 
pip2 install --upgrade pip 

# Install pip3:
python3 -m ensurepip

# Finally update pip3:
pip3 install --upgrade pip

$ pip3 -V
pip 9.0.1 from /usr/lib/python3.4/site-packages (python 3.4)

BTW. There are several forks of apt-cyg, but the best maintained is that of kou1okada, you'll love it.

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EDIT: 2018-11-15

Because I started out not using virtualenv, I recently had to refresh my Cygwin Python3 installation, and realized a few things in the process that should have been obvious, but can easily be forgotten.

• When installing and using Python3 on Cygwin (and probably on most other *nix distros), only install the basic Python3 interpreter as a Cygwin package. From then on, only use the pip installer.

• After you have installed or updated any python3 packages using pip, your Cygwin package manager will complain that your package is "Incomplete". That is because pip has replaced/updated the files in that package. Check with: cygcheck.exe -c |grep Incomplete.
  Do not re-install those packages with Cygwin.

# cygcheck.exe -c |grep Incomplete
python3-setuptools      34.3.2-1         Incomplete

So what I did, was clear out all python3 related Cygwin packages, except the Python3 itself. Then I re-installed the only one needed: python3-setuptools.

# apt-cyg remove python3-setuptools
apt-cyg install python3-setuptools

# Fix pip3 symlink (or just pip if you don't have python2)
ln -s /usr/bin/pip3.6 /usr/bin/pip3

# That also installs the Cygwin packages:  
# python3-appdirs, python3-packaging, python3-pyparsing, python3-six

# Now, update setuptools with pip:
pip3 install -U --force-reinstall --only-binary=:all: --no-clean --no-cache-dir setuptools

# pip list |grep setuptools
setuptools          40.5.0

That should have also have re-installed all the setuptools dependencies with the latest updates.

From now on, do yourself a favor and start using a virtual environment.

Answer 5

I just learned, inspired from https://www.scivision.co/install-pip-in-cygwin/ and the answer before, that instead of using pip, you just have to use pip2 for python2 or pip3 for python 3 in cygwin on windows. Wondered about this the whole day...

Answer 6

On windows, you can use pip to install packages. If you have multiple python installations under cygwin, give the full python path e.g. Python 2

/usr/bin/python2.7 -m pip install pyyaml

Python 3

/usr/bin/python3.6 -m pip install pyyaml

In case you dont have pip installed install it using below command

/usr/bin/python2.7 -m ensurepip 

or

/usr/bin/python3.6 -m ensurepip