TypeError: unsupported operand type(s) for |: 'NoneType' and 'int' code example

Example: TypeError: unsupported operand type(s) for -: 'str' and 'int'

#this is a int
Anmol = 1

#this is a str
Mom = "1"

Anmol + Mom
#if you add you get someting that looks like this
#TypeError: unsupported operand type(s) for -: 'str' and 'int'
#to fix do the following

Anmol + str(Mom)