When importing _constant_time
I was getting attribution error: _init.cffi_1_0_external_module
I decided to go check in _constant_time. And what is discover is _constant_time is not a python module but rather a cpp compiled library. (.so) .
So how is python importing from .so file? Or is something missing in cryptographic package?
According to an answer on Russian StackOverflow, you need to install cffi module as well.
sudo easy_install -U cffi
or
sudo pip install -U cffi
And on Windows the syntax is more like:
python -m pip install -U cffi
(according to How to run Pip commands from CMD?)
-m is needed on Windows since Windows doesn't interpret "shebang" (#!) interpreter lines so pip can't be run directly as on Linux/BSD/Unix/whatever, but needs to be run from python. -U tells pip or easy_install to install latest version of cffi available.
