python multiple try except block in my code -- can we shorten code

[deanhystad]

I think you mean procedural programming. Functional programming is something completely different.

I think rob101 is biased against exceptions. Probably comes from learning programming in a language where exceptions are difficult to use. Having written millions of lines of code both ways I think the code is always cleaner using exceptions in place of exhaustive testing.

That said, this is not the way to write exception handlers.

    try:
        backup(sourcepath,destinationpath)
    except Exception as e:
        print("Error occured while taking backup")
        logger.info("Error occured while taking backup")
        sys.exit()

If the only possible recovery is exiting the program, one exception handler that catches them all is adequate. The only modification's I would make to Gribouillis' code is to removing the comment on raise so I don't have to open a log file to see the error trace, and he already predicted that.

Exceptions where you can recover aren't handled all the differently. It is mostly a matter of locale. Dangerous code is wrapped by try/except. You might have multiple handlers for multiple exception types, but they should all perform some corrective action that lets you move on with execution of the program.

calculator = {
    "+": lambda a, b: a + b,
    "-": lambda a, b: a - b,
    "*": lambda a, b: a * b,
    "/": lambda a, b: a / b,
}

while True:
    try:
        equation = input("Enter equation ")
        a, op, b = equation.split()
        print(equation, "=", calculator[op](float(a), float(b)))
    except KeyError:
        print("Unrecognized operator:", equation)
    except ZeroDivisionError:
        print("Cannot divide by zero")
    except ValueError:
        print("""Equation format is "number opeator number".""")
        print("""Supported opeerators are +, -, *, /.""")