Python 3.7.3 : Using the pycryptodome python module.

This python module can be used with python 3.
More information can be found here.
PyCryptodome is a self-contained Python package of low-level cryptographic primitives.
It supports Python 2.6 and 2.7, Python 3.4 and newer, and PyPy.
The install of this python module is easy with pip tool:

C:\Python373\Scripts>pip install pycryptodome
Collecting pycryptodome
...
Installing collected packages: pycryptodome
Successfully installed pycryptodome-3.8.2

All packages from this python module are:

• Cipher;
• Signature;
• Hash;
• Publickey;
• Protocol;
• IO;
• Random and Util;

Let start with a few examples:

C:\Python373>python.exe
Python 3.7.3 (v3.7.3:ef4ec6ed12, Mar 25 2019, 21:26:53) [MSC v.1916 32 bit (Inte
l)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> from Crypto.Random import get_random_bytes
>>> key16 = get_random_bytes(16) # 16 bytes * 8 = 128 bits (1 byte = 8 bits)

The python module comes with features for encryption and dencryption, like RSA, AES, DES and many options.
Another good feature is KDF with PBKDF2 function:

>>> from Crypto.Protocol.KDF import PBKDF2
>>> center = b'go'
>>> password = 'go'
>>> output = PBKDF2(password, center, dkLen=64)
>>> print(output)
b'E\x0b\x91\x87\xde\xb2E\xe5Gv\x03\x86fVe8\x1e%\xb5l\xa0\xdb\xbfI\x01\xb5\xdf\x8
1\xad\x82@\x00\xacr\xc7\xa26\xc6\xe92\x1e\xf8\xe9\x0b\x9e\x93\x1dj\x1c\xff\x1c4\
xc2\x0e6\xc2\x8eYc2N\x995\x87'
>>>

If you are a fan of encryption and decryption math, then this module will enable you to use it.
By studying this module you can give a more in-depth view of what exists in this field and what does not exist.