Develop Reference

Cythonize into a python3.6 wheel on Ubuntu 14

For legacy reasons, I have a mix of C/C++ and python code that can only be compiled on Ubuntu 14. The python code is compatible with python3.6. We have been generating python3.6 compatible pip wheels for distribution. The pip wheel is generated using python2.7.
We added a new python3.6 module that we need to cythonize.
I have successfully generated a cythonized python2.7 wheel after running
sudo apt-get install python-dev
sudo pip install cython
To get a python3.6 wheel I tried to do
sudo apt-get install python3.6-dev
However, that is not supported on Ubuntu14.
I also tried to generate a python3.4 wheel with
sudo apt-get install python3-dev
sudo pip3 install cython
This fails with
File "/usr/lib/python3/dist-packages/wheel/bdist_wheel.py", line 155, in get_tag
assert tag == supported_tags[0]
The following are not an option for us :
Use of non standard repos like thus :
sudo add-apt-repository ppa:deadsnakes/ppa
making the entire code base compilable on ubuntu18
How can I get a cythonized python3.6 pip wheel given these constraints ?
Update :
The answer is to build and install python3.6 from source on Ubuntu14 and cythonize as usual using python3.6.

Not able to install package because pip is not installed

I am running Ubuntu and have both python 2.7 and python 3.5 on my system
I have tweaked the settings so that when I do
python test.py
python3 runs
I wanted to install the module pyperclip in python3..
pip install pyperclip
installed it for python 2
Quick google search suggested to use
pip3 install pyperclip
but I get
pip3 is currently not installed . You can install it by typing
sudo apt install python3-pip
When I run this command I get the following:
The following packages have unmet dependencies:
python3-pip : Depends: python-pip-whl (= 8.1.1-2) but 8.1.1- 2ubuntu0.2 is to be installed
Recommends: python3-dev (>= 3.2) but it is not going to be installed
Recommends: python3-setuptools but it is not going to be installed
Recommends: python3-wheel but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
What should I do?

It seems like it could be an error in your path. If you installed Python 3.5 it should come with pip, so try doing python -m pip and this should run Python 3.5's pip. To install something, simply use the normal pip commands as you have, for example python -m pip install pyperclip.

Use the aptitude package manager as it will provide you simple suggestion to fix your unmet dependencies problem. Install it via apt:
sudo apt-get install aptitude
Then install pip3 with this command:
sudo aptitude install python3-pip
Then choose the solution suggested to you by aptitude. In one of the suggestions aptitude will suggest you to downgrade from 8.1.1-2ubuntu0.2 to 8.1.1-2. Accepting this suggestion solves the issue. Just make sure the downgrade doesn't cause you other hurdles.

How to install Django in Ubuntu 11.10

I am very new to Ubuntu OS and Python as well. I want to install Django. But i dont have easy_install and I tried below command to install pip
sudo apt-get install python-pip
I got an error as below
Unable to locate package python-pip
I tried below command as well
sudo apt-get install python-pip
and i got error as below
E: Package 'python-setuptools' has no installation candidate
I am very confused in installing django, How to successfully install django

First update repositories
sudo apt-get update
then try
sudo apt-get install python-pip python-dev build-essential python-setuptools
if nothing, you can install pip and setuptools packages manually. Download them from PyPI.

Install pip
To install or upgrade pip, securely download get-pip.py.
Then run the following (which may require administrator access):
sudo python get-pip.py
If setuptools (or distribute) is not already installed, get-pip.py will install setuptools for you.
To upgrade an existing setuptools (or distribute), run pip install -U setuptools
Upgrade pip
On Linux or OS X:
sudo pip install -U pip
Then you can download django using pip,
sudo pip install django

Install
First you need make sure you have Python install, here I take 2.7.6 as example. For how to install Python, you can go check this link:
https://askubuntu.com/questions/443048/python-2-7-6-on-ubuntu-12-04-how-to
Then you can start install Django and setup database as follow:
sudo apt-get install python-django
sudo apt-get install mysql-server
sudo apt-get install python-mysqldb
You can find more configuration detail in this link
http://yuwenqing.org/?p=108
Also, for less pain in future develop, you should deploy your Django application in python virtualEnv, here are some detail of why you need virtualEnv.
http://yuwenqing.org/?p=126

Install numpy in Python virtualenv

I've created virtualenv for Python 2.7.4 on Ubuntu 13.04. I've installed python-dev.
I have the error when installing numpy in the virtualenv.
Maybe, you have any ideas to fix?

The problem is SystemError: Cannot compile 'Python.h'. Perhaps you need to install python-dev|python-devel.
so do the following in order to obtain 'Python.h'
make sure apt-get and gcc are up to date
sudo apt-get update
sudo apt-get upgrade gcc
then install the python2.7-dev
sudo apt-get install python2.7-dev
and I see that you have most probably already done the above things.
pip will eventually spit out another error for not being able to write into /user/bin/blahBlah/dist-packages/ or something like that because it couldn't figure out that it was supposed to install your desiredPackage (e.g. numpy) within the active env (the env created by virtualenv which you might have even changed directory to while doing all this)
so do this:
pip -E /some/path/env install desiredPackage
that should get the job done... hopefully :)
---Edit---
From PIP Version 1.1 onward, the command pip -E doesn't work. The following is an excerpt from the release notes of version 1.1 (https://pip.pypa.io/en/latest/news.html)
Removed -E/--environment option and PIP_RESPECT_VIRTUALENV; both use a restart-in-venv mechanism that's broken, and neither one is useful since every virtualenv now has pip inside it. Replace pip -E path/to/venv install Foo with virtualenv path/to/venv && path/to/venv/pip install Foo

If you're on Python3 you'll need to do sudo apt-get install python3-dev. Took me a little while to figure it out.

If you're hitting this issue even though you've installed all OS dependencies (python-devel, fortran compiler, etc), the issue might be instead related to the following bug:
"numpy installation thru install_requires directive issue..."
Work around is to manually install numpy in your (virtual) environment before running setup.py to install whatever you want to install that depends on numpy.
eg, pip install numpy then python ./setup.py install

This answer is for those of us that compiled python from source or installed it to a non standard directory. In my case, python2.7 was installed to /usr/local and the include files were installed to /usr/local/include/python2.7
C_INCLUDE_PATH=/usr/local/include/python2.7:$C_INCLUDE_PATH pip install numpy

I recently had the same problem. I run Debian Jessie and tried to install numpy from a Python 2.7.9 virtualenv. I got the same error -- numpy complaining that Python.h is missing while python2.7-dev and gcc are already installed.
File "numpy/core/setup.py", line 42, in check_types
],
File "numpy/core/setup.py", line 293, in check_types
SystemError: Cannot compile 'Python.h'. Perhaps you need to install python-dev|python-devel.
I'm running pip 1.5.6 and it doesn't appear to have command line option '-E'
$ pip -V
pip 1.5.6 from /home/alex/.virtualenvs/myenv/local/lib/python2.7/site- packages (python 2.7)
Upgrading pip to the latest verson 7.0.3 solves the problem
$ pip install --upgrade pip
Downloading/unpacking pip from https://pypi.python.org/packages/py2.py3/p/pip/pip-7.0.3-py2.py3-none-any.whl#md5=6950e1d775fea7ea50af690f72589dbd
Downloading pip-7.0.3-py2.py3-none-any.whl (1.1MB): 1.1MB downloaded
Installing collected packages: pip
Found existing installation: pip 1.5.6
Uninstalling pip:
Successfully uninstalled pip
Successfully installed pip
Cleaning up...
Now it is possible to install numpy
$ pip install numpy
Collecting numpy
Downloading numpy-1.9.2.tar.gz (4.0MB)
100% |████████████████████████████████| 4.0MB 61kB/s
Installing collected packages: numpy
Running setup.py install for numpy
Successfully installed numpy-1.9.2

This is probably because you do not have the python-dev package installed. You can install it like this:
sudo apt-get install python-dev
You can also install it via the Software Center:

#samkhan13 solution didn't work for me as pip said it doesn't have the -E option.
I was still getting the same error, but what worked for me was to install matplotlib, which installed numpy.

Installing SciPy with pip

It is possible to install NumPy with pip using pip install numpy.
Is there a similar possibility with SciPy? (Doing pip install scipy does not work.)
Update
The package SciPy is now available to be installed with pip!

Prerequisite:
sudo apt-get install build-essential gfortran libatlas-base-dev python-pip python-dev
sudo pip install --upgrade pip
Actual packages:
sudo pip install numpy
sudo pip install scipy
Optional packages:
sudo pip install matplotlib OR sudo apt-get install python-matplotlib
sudo pip install -U scikit-learn
sudo pip install pandas
src

An attempt to easy_install indicates a problem with their listing in the Python Package Index, which pip searches.
easy_install scipy
Searching for scipy
Reading http://pypi.python.org/simple/scipy/
Reading http://www.scipy.org
Reading http://sourceforge.net/project/showfiles.php?group_id=27747&package_id=19531
Reading http://new.scipy.org/Wiki/Download
All is not lost, however; pip can install from Subversion (SVN), Git, Mercurial, and Bazaar repositories. SciPy uses SVN:
pip install svn+http://svn.scipy.org/svn/scipy/trunk/#egg=scipy
Update (12-2012):
pip install git+https://github.com/scipy/scipy.git
Since NumPy is a dependency, it should be installed as well.

In Ubuntu 10.04 (Lucid), I could successfully pip install scipy (within a virtualenv) after installing some of its dependencies, in particular:
$ sudo apt-get install libamd2.2.0 libblas3gf libc6 libgcc1 libgfortran3 liblapack3gf libumfpack5.4.0 libstdc++6 build-essential gfortran libatlas-sse2-dev python-all-dev

To install scipy on windows follow these instructions:-
Step-1 : Press this link http://www.lfd.uci.edu/~gohlke/pythonlibs/#scipy to download a scipy .whl file (e.g. scipy-0.17.0-cp34-none-win_amd64.whl).
Step-2: Go to the directory where that download file is there from the command prompt (cd folder-name ).
Step-3: Run this command:
pip install scipy-0.17.0-cp27-none-win_amd64.whl

I tried all the above and nothing worked for me. This solved all my problems:
pip install -U numpy
pip install -U scipy
Note that the -U option to pip install requests that the package be upgraded. Without it, if the package is already installed pip will inform you of this and exit without doing anything.

If I first install BLAS, LAPACK and GCC Fortran as system packages (I'm using Arch Linux), I can get SciPy installed with:
pip install scipy

On Fedora, this works:
sudo yum install -y python-pip
sudo yum install -y lapack lapack-devel blas blas-devel
sudo yum install -y blas-static lapack-static
sudo pip install numpy
sudo pip install scipy
If you get any public key errors while downloading, add --nogpgcheck as parameter to yum, for example:
yum --nogpgcheck install blas-devel
On Fedora 23 onwards, use dnf instead of yum.

For the Arch Linux users:
pip install --user scipy prerequisites the following Arch packages to be installed:
gcc-fortran
blas
lapack

Addon for Ubuntu (Ubuntu 10.04 LTS (Lucid Lynx)):
The repository moved, but a
pip install -e git+http://github.com/scipy/scipy/#egg=scipy
failed for me... With the following steps, it finally worked out (as root in a virtual environment, where python3 is a link to Python 3.2.2):
install the Ubuntu dependencies (see elaichi), clone NumPy and SciPy:
git clone git://github.com/scipy/scipy.git scipy
git clone git://github.com/numpy/numpy.git numpy
Build NumPy (within the numpy folder):
python3 setup.py build --fcompiler=gnu95
Install SciPy (within the scipy folder):
python3 setup.py install

In my case, it wasn't working until I also installed the following package : libatlas-base-dev, gfortran
sudo apt-get install libatlas-base-dev gfortran
Then run pip install scipy

install python-3.4.4
scipy-0.15.1-win32-superpack-python3.4
apply the following commend doc
py -m pip install --upgrade pip
py -m pip install numpy
py -m pip install matplotlib
py -m pip install scipy
py -m pip install scikit-learn

The answer is yes, there is.
First you can easily install numpy use commands:
pip install numpy
Then you should install mkl, which is required by Scipy, and you can download it here
After download the file_name.whl you install it
C:\Users\****\Desktop\a> pip install mkl_service-1.1.2-cp35-cp35m-win32.whl
Processing c:\users\****\desktop\a\mkl_service-1.1.2-cp35-cp35m-win32.whl
Installing collected packages: mkl-service
Successfully installed mkl-service-1.1.2
Then at the same website you can download scipy-0.18.1-cp35-cp35m-win32.whl
Note:You should download the file_name.whl according to you python version, if you python version is 32bit python3.5 you should download this one, and the "win32" is about your python version, not your operating system version.
Then install file_name.whl like this:
C:\Users\****\Desktop\a>pip install scipy-0.18.1-cp35-cp35m-win32.whl
Processing c:\users\****\desktop\a\scipy-0.18.1-cp35-cp35m-win32.whl
Installing collected packages: scipy
Successfully installed scipy-0.18.1
Then there is only one more thing to do: comment out a specfic line or there will be error messages when you imput command "import scipy".
So comment out this line
from numpy._distributor_init import NUMPY_MKL # requires numpy+mkl
in this file: your_own_path\lib\site-packages\scipy__init__.py
Then you can use SciPy :)
Here tells you more about the last step.
Here is a similar anwser to a similar question.

Besides all of these answers,
If you install python of 32bit on your 64bit machine, you have to download scipy of 32-bit irrespective of your machine.
http://www.lfd.uci.edu/~gohlke/pythonlibs/
In the above URL you can download the packages and command is: pip install

For gentoo, it's in the main repository:
emerge --ask scipy

You can also use this in windows with python 3.6 python -m pip install scipy