Why does the following program result in an error?

def check_age(age):
    """A docstring that gives nothing away"""
    if age < 18:
        underage = True
    elif age > 18:
        underage = False
    return underage
print(check_age(18))

In the following code (representing an attempt to bribe a tramper), what would you have to change so that the function go_on_tramp gets called, regardless of the value of payment? You may assume that both payment (an assigned integer) and the function go_on_tramp are defined elsewhere.

if payment >= 50:
    payment_is_sufficient = True
else:
    payment_is_sufficient = False
if payment_is_sufficient and (not payment_is_sufficient):
    go_on_tramp()

Given the following code for determining if a person has paid enough to go on a tramp:

if payment >= 50:
    payment_is_sufficient = True
else:
    payment_is_sufficient = False
if payment_is_sufficient and (not payment_is_sufficient):
    go_on_tramp()

Which of the following payments will ensure that the function go_on_tramp, assumed to be defined elsewhere, gets called?

What does the following code print?

number = 45
if number >= 70:
    print("Luke, I am your father")
elif number >= 45:
    print("I'll be Bach")
elif number > 15:
    print("...Bond. James Bond.")
else:
    print("Go ahead, make my day")