# David Kauchak
# 2/24/25
#
# Some examples illustrating error handling using:
#  - isinstance
#  - try-except blocks

def calc_prob_attempt(successes, trials):
    return float(successes)/trials

def calc_prob_better(successes, trials):
    if isinstance(successes, int) and isinstance(trials, int):
        return float(successes)/trials
    else:
        print "calc_prob_better must be called with ints!"
        
def calc_prob_even_better(successes, trials):
    if isinstance(successes, int) and isinstance(trials, int):
        try:
            return float(successes)/trials
        except:
            print "calc_prob_even_better had a problem :("
    else:
        print "calc_prob_even_better must be called with ints!"
        
def calc_prob(successes, trials):
    if isinstance(successes, int) and isinstance(trials, int):
        try:
            return float(successes)/trials
        except (ZeroDivisionError):
            print "trials must be non-zero!"
    else:
        print "calc_prob must be called with ints!"     
        
def calc_prob2(successes, trials):
    try:
        return float(successes)/trials
    except (ZeroDivisionError):
        print "trials must be non-zero!"
    except:
        print "calc_prob2 had a problem :("