我正在尝试编写一个计算平均数的程序，并确定用户输入的最大+最小数。我遵循了教练的指导方针，但最后，它搞砸了，我不知道我做错了哪一步。请看一下，给我一些建议，谢谢。
MAX_PINTS = 256
def valid_real(value):
try:
if float(value) >= 0:
return True
if float(value) < 0:
return False
except ValueError:
return False
def get_real(prompt):
value = ""
value = input(prompt)
while not valid_real(value):
print(value, "is not a valid number. Please try again.")
value = input(prompt)
return float(value)
def y_or_n(prompt):
value = ""
value = input(prompt)
while True:
if value == "Yes" or value == "yes":
return True
elif value == "No" or value == "no":
return False
else:
print("Please enter yes or no!")
value = input(prompt)
def get_pints_collected(pints_collected):
done = False
counter = 0
while not done:
for turn_counter in range (7):
pints_collected[counter] = get_real("Please enter your collected pints: ")
counter = counter + 1
done = y_or_n("Do you want to end program? (Enter yes or no)")
return counter
def calculate_pints_average(pints_collected):
total = 0
minimum = pints_collected[0]
maximum = pints_collected[0]
for i in range (7):
total = total + pints_collected[i]
if pints_collected[i] > maximum:
maximum = pints_collected[i]
if pints_collected[i] < minimum:
minimum = pints_collected[i]
pints_average = total / 7
def output(pints_average, maximum, minimum):
pints_average = 0
maximum = 0
minimum = 0
print ("The average number of pints donated is: ", pints_average)
print ("The highest pints donated is: ", maximum)
print ("The lowest pints donated is: ", minimum)
def final():
pints_collected = [0.0 for x in range (MAX_PINTS) ]
pints_average = 0.0
number_pints_collected = 0
maximum = 0.0
minimum = 0.0
pints_collected = get_pints_collected(pints_collected)
pints_average = calculate_pints_average(pints_collected)
output(pints_average, maximum, minimum)
final()