PY_SSIZE_T_CLEAN macro must be defined for '#' formats

[bjenmonk]

On 3.10 any module(s) that use the # variant when parsing arguments need to have a #define PY_SSIZE_T_CLEAN before including Python.h.

From the docs:

For all # variants of formats (s#, y#, etc.), the macro PY_SSIZE_T_CLEAN must be defined before including Python.h. On Python 3.9 and older, the type of the length argument is Py_ssize_t if the PY_SSIZE_T_CLEAN macro is defined, or int otherwise.

Solution
pip uninstall pycrypto
pip install pycryptodome

Can you update the requirements.txt with pycryptodome

BTW, thanks for the package. Great Job.