expecting-the-unexpected

etu1.py

def something_dangerous(x):
    print("computing reciprocal of", x)
    return 1 / x
try:
    for x in [2, 1, 0, -1]:
        print("1/{} = {}".format(x, something_dangerous(x)))
        
except ArithmeticError as error:
    print("Something went terribly wrong:", error)
    
# output:
# computing reciprocal of 2
# 1/2 = 0.5
# computing reciprocal of 1
# 1/1 = 1.0
# computing reciprocal of 0
# Something went terribly wrong: division by zero

etu2.py

input_list = [2, 1, 0, -1]
reciprocals = [something_dangerous(item)
               for item in input_list]

print("The reciprocal of", input_list, "is", reciprocals)