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Unable to download a package using Pip : says Cython not installed when it is

I am trying to download the pyahocorasick package on my Windows 10 system using pip.
On my command line, I wrote-
pip install pyahocorasick
It gave the following output -
Collecting pyahocorasick
Using cached pyahocorasick-1.1.4.tar.bz2
Installing collected packages: pyahocorasick
Running setup.py install for pyahocorasick ... error
Complete output from command c:\python34\python.exe -u -c "import setuptools, tokenize;__file__='C:\\Users\\Krishna\\AppData\\Local\\Temp\\pip-build-b7a1mq0t\\pyahocorasick\\setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record C:\Users\Krishna\AppData\Local\Temp\pip-3iv3a5oc-record\install-record.txt --single-version-externally-managed --compile:
running install
running build
running build_ext
failed to import Cython: DLL load failed: %1 is not a valid Win32 application.
error: Cython does not appear to be installed
----------------------------------------
Command "c:\python34\python.exe -u -c "import setuptools, tokenize;__file__='C:\\Users\\Krishna\\AppData\\Local\\Temp\\pip-build-b7a1mq0t\\pyahocorasick\\setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record C:\Users\Krishna\AppData\Local\Temp\pip-3iv3a5oc-record\install-record.txt --single-version-externally-managed --compile" failed with error code 1 in C:\Users\Krishna\AppData\Local\Temp\pip-build-b7a1mq0t\pyahocorasick\
Then I tried to see if Cython is in fact installed, so I wrote-
Cython version
and the output was -
Traceback (most recent call last):
File "C:\Python34\lib\runpy.py", line 170, in _run_module_as_main
"__main__", mod_spec)
File "C:\Python34\lib\runpy.py", line 85, in _run_code
exec(code, run_globals)
File "C:\Python34\Scripts\cython.exe\__main__.py", line 5, in <module>
File "C:\Python34\lib\site-packages\Cython\Compiler\Main.py", line 28, in <module>
from .Scanning import PyrexScanner, FileSourceDescriptor
ImportError: DLL load failed: %1 is not a valid Win32 application.
And finally I tried -
install Cython
And the output was -
Requirement already satisfied: Cython in c:\python34\lib\site-packages
So my question is - if Cython is already installed, why does installing the package pyahocorasick give the error - Cython does not appear to be installed? And how can I fix this problem?

Linux : unable to install kivy in virtual environment

I am using python2.7 and created a virtual environment 'kivyenv'.
First i install Cython and then kivy in kivyenv.
pip install Cython
pip install kivy
kivy failed to install giving some error :-
In file included from /tmp/pip-build-4T9oG4/kivy/kivy/graphics/opengl.c:274:0:
/tmp/pip-build-4T9oG4/kivy/kivy/graphics/gl_redirect.h:43:22: fatal error: GL/gl.h: No such file or directory
# include <GL/gl.h>
^
compilation terminated.
error: command 'x86_64-linux-gnu-gcc' failed with exit status 1
----------------------------------------
Command "/root/kivyenv/bin/python2.7 -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-4T9oG4/kivy/setup.py';
exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))"
install --record /tmp/pip-3__DxE-record/install-record.txt --single-version-externally-managed --compile --install-headers
/root/kivyenv/include/site/python2.7/kivy" failed with error code 1 in /tmp/pip-build-4T9oG4/kivy/
I am using Ubuntu 16.

This is happening because you do not have dependency libraries installed on your system, specifically the ones for OpenGL - most likely you do not have mesa packages installed.
Follow the instructions for your specific distribution on how to install all of the needed dependencies at: https://kivy.org/docs/installation/installation-linux.html#using-software-packages

had the same problem. the following worked for me:
pip(3) install Cython==0.26
pip(3) install kivy
hope it helps

Trouble Installing Pillow: Why Am I Receiving Errors?

I'm attempting to install pillow via pip (i.e. sudo pip install pillow) but without much success.
Can anyone tell me what the problem is?
Here are the errors I receive:
clang: error: unknown argument: '-mno-fused-madd' [-Wunused-command-line-argument-hard-error-in-future]
clang: note: this will be a hard error (cannot be downgraded to a warning) in the future
error: command 'clang' failed with exit status 1
----------------------------------------
Cleaning up...
Command /usr/bin/python -c "import setuptools, tokenize;__file__='/private/tmp/pip_build_root/pillow/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-l7hSHg-record/install-record.txt --single-version-externally-managed --compile failed with error code 1 in /private/tmp/pip_build_root/pillow

try with
sudo ARCHFLAGS=-Wno-error=unused-command-line-argument-hard-error-in-future pip install pillow
you will see a lot of warnings but it worked for me.
the unused arguments was preventing further install of pillow. the above tells it to not treat the unused argument as an error.
Source: a/22774631/1142814
EDIT: I link here the official issue you linked in your comment, maybe it can be helpful for someone else: https://github.com/python-imaging/Pillow/issues/527

OS X Pillow installation error

I followed this instructions: http://pillow.readthedocs.org/en/latest/installation.html#mac-os-x-installation
$ sudo pip install Pillow
returned error:
clang: error: unknown argument: '-mno-fused-madd' [-Wunused-command-line-argument-hard-error-in-future]
clang: note: this will be a hard error (cannot be downgraded to a warning) in the future
error: command 'cc' failed with exit status 1
----------------------------------------
Cleaning up...
Command /usr/bin/python -c "import setuptools, tokenize;__file__='/private/tmp/pip_build_root/Pillow/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-bAG3wP-record/install-record.txt --single-version-externally-managed --compile failed with error code 1 in /private/tmp/pip_build_root/Pillow
Storing debug log for failure in /var/root/Library/Logs/pip.log
in pip.log:
Traceback (most recent call last):
File "/Library/Python/2.7/site-packages/pip/basecommand.py", line 122, in main
status = self.run(options, args)
File "/Library/Python/2.7/site-packages/pip/commands/install.py", line 283, in run
requirement_set.install(install_options, global_options, root=options.root_path)
File "/Library/Python/2.7/site-packages/pip/req.py", line 1435, in install
requirement.install(install_options, global_options, *args, **kwargs)
File "/Library/Python/2.7/site-packages/pip/req.py", line 706, in install
cwd=self.source_dir, filter_stdout=self._filter_install, show_stdout=False)
File "/Library/Python/2.7/site-packages/pip/util.py", line 697, in call_subprocess
% (command_desc, proc.returncode, cwd))
InstallationError: Command /usr/bin/python -c "import setuptools, tokenize;__file__='/private/tmp/pip_build_root/Pillow/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-bAG3wP-record/install-record.txt --single-version-externally-managed --compile failed with error code 1 in /private/tmp/pip_build_root/Pillow
Please, help me!
UPDATE:
I installed PIL before. After installation I tried some black magic to make PIL work with libjpeg. And then I tried to reinstall PIL. It was uninstalled, but failed to install.

There seems to be something broken when running XCode 5.1. Had the same problem when installing pycrypto.
Try this:
ARCHFLAGS=-Wno-error=unused-command-line-argument-hard-error-in-future pip install Pillow

Installation of Pandas fails on Ubuntu 12.04

As per the Pandas community page (http://pandas.pydata.org/community.html), I am posting here first...
I am trying to install Pandas using pip, inside a virtual environment on a vanilla remote server running Ubuntu 12.04.3 (64bit). I have already installed the usual suspects (python-dev (2.7), numpy, scipy). Pandas does not get installed and I am not sure exactly what to change or add to ensure this happens.
I have seen other references (not with the same error) implying that memory may be an issue; the remote server (Digital Ocean droplet) only has 512MB.
The tail of the pip error log is shown below:
gcc: internal compiler error: Killed (program cc1)
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-4.6/README.Bugs> for instructions.
error: command 'gcc' failed with exit status 4
----------------------------------------
Command /srv/tp/venv/bin/python -c "import setuptools;__file__='/srv/tp/venv/build/pandas/setup.py';exec(compile(open(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --single-version-externally-managed --record /tmp/pip-0bOHrG-record/install-record.txt --install-headers /srv/tp/venv/include/site/python2.7 failed with error code 1 in /srv/tp/venv/build/pandas
Exception information:
Traceback (most recent call last):
File "/srv/tp/venv/local/lib/python2.7/site-packages/pip-1.1-py2.7.egg/pip/basecommand.py", line 104, in main
status = self.run(options, args)
File "/srv/tp/venv/local/lib/python2.7/site-packages/pip-1.1-py2.7.egg/pip/commands/install.py", line 250, in run
requirement_set.install(install_options, global_options)
File "/srv/tp/venv/local/lib/python2.7/site-packages/pip-1.1-py2.7.egg/pip/req.py", line 1133, in install
requirement.install(install_options, global_options)
File "/srv/tp/venv/local/lib/python2.7/site-packages/pip-1.1-py2.7.egg/pip/req.py", line 577, in install
cwd=self.source_dir, filter_stdout=self._filter_install, show_stdout=False)
File "/srv/tp/venv/local/lib/python2.7/site-packages/pip-1.1-py2.7.egg/pip/__init__.py", line 256, in call_subprocess
% (command_desc, proc.returncode, cwd))
InstallationError: Command /srv/tp/venv/bin/python -c "import setuptools;__file__='/srv/tp/venv/build/pandas/setup.py';exec(compile(open(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --single-version-externally-managed --record /tmp/pip-0bOHrG-record/install-record.txt --install-headers /srv/tp/venv/include/site/python2.7 failed with error code 1 in /srv/tp/venv/build/pandas

I was having the same problem and error on ubuntu and then created a swapfile and it was solved! A tutorial can be found in the link below but in short:
sudo dd if=/dev/zero of=/swapfile bs=1024 count=524288
sudo chmod 600 /swapfile
sudo mkswap /swapfile
sudo swapon /swapfile
https://www.digitalocean.com/community/articles/how-to-add-swap-on-ubuntu-12-04
After the swap file was created I restarted the server, typed pip install pandas and it finally worked.

The most secure way though is just: sudo apt-get install python-pandas

Probably it's out of memory error. At the top of you log, I can see gcc exit with code error 4. When I google it I saw a stackoverflow thread: Installing lxml with pip in virtualenv Ubuntu 12.10 error: command 'gcc' failed with exit status 4 .