unsupported operand type(s) for |: 'str' and 'InstrumentedAttribute'" code example

Example 1: TypeError: unsupported operand type(s) for +: 'int' and 'str'

do not combine int with string !
Example:int + string = error
correct example: int + int = no error 
                 string + string = no error

Example 2: python unsupported operand type(s) for & 'str' and 'str'

# use and in stead of & in python