# If you are using Python 2 (Windows)

pip install Cython

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# if you are using Python 3 (Windows)

pip3 install Cython

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# If the pip is not set as environment varibale PATH

python -m pip install Cython

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# If you are using Python 2 (Linux)

sudo pip install Cython

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# if you are using Python 3 (Linux)

sudo pip3 install Cython

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# In case if you have to easy_install

sudo easy_install -U Cython

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# On Centos

yum install Cython

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# On Ubuntu

sudo apt-get install Cython

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# If you are installing it in Anaconda 

conda install -c conda-forge Cython

pip install --upgrade cython

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!pip install Cython