To be noted...

how to organise your program...

• use 4 spaces for indentation
• imports should go at the top of the file
• separate function definitions with two blank lines
• keep function definitions together
• keep top level statements, including function calls, together at the bottom of the program

rules of "and" and "or" operators...

• all values are true: 

and returns last value
or returns first value

• false and true values: 

and returns the first false value
or returns the first true value

• all values are false:

and returns first value
or returns last value