ImportError: No module named 'Cython' [duplicate]

Question

I'm trying do from Cython.Build import cythonize and I get the message ImportError: No module named 'Cython', but I instaled the Cython with the comand pip install Cython. What's wrong?

Python 3.5 Cython 0.25.2 Windows 8

Answer 1

just directly install from pypi: pip install Cython
https://pypi.org/project/Cython/

Answer 2

Use Pip3 command:

pip3 install --upgrade cython