ShippingCosts.py

def exercise_02 ():
    print("  Exercise 02 - Shipping Charges Calculator")
    weight = input("    Enter the mass of the package (kg): ",type=float)
    while not (weight > 0 and weight <= 30):
        weight = input("    Invalid mass. Try again: ",type=float)

    method = input("    Enter shipping method (A|S): ",type=str).upper()
    while not (method in ['A','S']):
        method = input("    Invalid shipping method: ",type=str)

    cost = 0
    if weight < 2.5:
        cost = 4.95
    elif weight >= 2.5 and weight < 10:
        cost = 8.95
    elif weight >= 10 and weight < 30:
        cost = 15.95
    elif weight >= 30:
        cost = 22.95
    if method == 'A':
        cost = cost * 1.5
    cost = round(cost,2)
    print("      This package will cost $%s" % cost)