I have written a lot of code in Python2. Not as much in Python3.
One thing I used Python for a lot is to quickly convert string values into base64 encoding. https://en.wikipedia.org/wiki/Base64
In Python2 that looks something like this (using the repl)
Python 2.7.5 (default, Oct 30 2018, 23:45:53) [GCC 4.8.5 20150623 (Red Hat 4.8.5-36)] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import base64 >>> base64.b64encode("test") 'dGVzdA=='
Sadly that quickly typed sequence does not work in Python3. Sigh.
The base64 module from Python2 used to take a string as an argument to the b64encode call. https://docs.python.org/2/library/base64.html
In Python3 that has changed and it now accepts a "bytes-like-object."
And out of the box a string is not a bytes-like-object. So you have to convert it to use the string with b64encode.
Again using the Python repl now with Python3
Python 3.7.5 (default, Nov 6 2019, 11:03:32) [Clang 8.0.0 (clang-800.0.42.1)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> s="test" >>> import base64 >>> bytes(s,"utf-8") b'test' >>> base64.b64encode(bytes(s,"utf-8")) b'dGVzdA=='
Sadly more things to type with your fingers. But not fast and loose with the data types.